1631965 has 12 divisors (see below), whose sum is σ = 2050524. Its totient is φ = 1246784.

The previous prime is 1631957. The next prime is 1631969. The reversal of 1631965 is 5691361.

It can be written as a sum of positive squares in 2 ways, for example, as 256036 + 1375929 = 506^2 + 1173^2 .

It is not a de Polignac number, because 1631965 - 2³ = 1631957 is a prime.

It is a super-2 number, since 2×1631965² = 5326619522450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2337 + ... + 2953.

It is an arithmetic number, because the mean of its divisors is an integer number (170877).

2^1631965 is an apocalyptic number.

It is an amenable number.

1631965 is a deficient number, since it is larger than the sum of its proper divisors (418559).

1631965 is an equidigital number, since it uses as much as digits as its factorization.

1631965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668 (or 645 counting only the distinct ones).

The product of its digits is 4860, while the sum is 31.

The square root of 1631965 is about 1277.4838550839. The cubic root of 1631965 is about 117.7344646781.

It can be divided in two parts, 16319 and 65, that added together give a 14-th power (16384 = 2¹⁴).

The spelling of 1631965 in words is "one million, six hundred thirty-one thousand, nine hundred sixty-five".