1281651 has 8 divisors (see below), whose sum is σ = 1953024. Its totient is φ = 732360.

The previous prime is 1281649. The next prime is 1281653. The reversal of 1281651 is 1561821.

It is an interprime number because it is at equal distance from previous prime (1281649) and next prime (1281653).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1281651 - 2¹ = 1281649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1281653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30495 + ... + 30536.

It is an arithmetic number, because the mean of its divisors is an integer number (244128).

2^1281651 is an apocalyptic number.

1281651 is a deficient number, since it is larger than the sum of its proper divisors (671373).

1281651 is an equidigital number, since it uses as much as digits as its factorization.

1281651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61041.

The product of its digits is 480, while the sum is 24.

The square root of 1281651 is about 1132.1002605777. The cubic root of 1281651 is about 108.6233669352.

The spelling of 1281651 in words is "one million, two hundred eighty-one thousand, six hundred fifty-one".