156965 has 4 divisors (see below), whose sum is σ = 188364. Its totient is φ = 125568.

The previous prime is 156943. The next prime is 156967. The reversal of 156965 is 569651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 569651 = 331 ⋅1721.

It can be written as a sum of positive squares in 2 ways, for example, as 119716 + 37249 = 346^2 + 193^2 .

It is a cyclic number.

It is not a de Polignac number, because 156965 - 2⁶ = 156901 is a prime.

It is a super-2 number, since 2×156965² = 49276022450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15692 + ... + 15701.

It is an arithmetic number, because the mean of its divisors is an integer number (47091).

2¹⁵⁶⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

156965 is a deficient number, since it is larger than the sum of its proper divisors (31399).

156965 is an equidigital number, since it uses as much as digits as its factorization.

156965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31398.

The product of its digits is 8100, while the sum is 32.

The square root of 156965 is about 396.1880866457. The cubic root of 156965 is about 53.9428980296.

Subtracting 156965 from its reverse (569651), we obtain a triangular number (412686 = T₉₀₈).

The spelling of 156965 in words is "one hundred fifty-six thousand, nine hundred sixty-five".