1612981 has 4 divisors (see below), whose sum is σ = 1652364. Its totient is φ = 1573600.

The previous prime is 1612957. The next prime is 1612991. The reversal of 1612981 is 1892161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72900 + 1540081 = 270^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 1612981 - 2¹¹ = 1610933 is a prime.

It is a super-2 number, since 2×1612981² = 5203415412722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1612931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19630 + ... + 19711.

It is an arithmetic number, because the mean of its divisors is an integer number (413091).

2^1612981 is an apocalyptic number.

It is an amenable number.

1612981 is a deficient number, since it is larger than the sum of its proper divisors (39383).

1612981 is an equidigital number, since it uses as much as digits as its factorization.

1612981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39382.

The product of its digits is 864, while the sum is 28.

The square root of 1612981 is about 1270.0318893634. The cubic root of 1612981 is about 117.2761635732.

It can be divided in two parts, 16129 and 81, that multiplied together give a square (1306449 = 1143²).

The spelling of 1612981 in words is "one million, six hundred twelve thousand, nine hundred eighty-one".