156961 has 8 divisors (see below), whose sum is σ = 190080. Its totient is φ = 126528.

The previous prime is 156943. The next prime is 156967. The reversal of 156961 is 169651.

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

It is a cyclic number.

It is not a de Polignac number, because 156961 - 2⁷ = 156833 is a prime.

It is an Ulam number.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541 + ... + 778.

It is an arithmetic number, because the mean of its divisors is an integer number (23760).

2¹⁵⁶⁹⁶¹ is an apocalyptic number.

It is an amenable number.

156961 is a deficient number, since it is larger than the sum of its proper divisors (33119).

156961 is a wasteful number, since it uses less digits than its factorization.

156961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343.

The product of its digits is 1620, while the sum is 28.

The square root of 156961 is about 396.1830385062. The cubic root of 156961 is about 53.9424398098.

The spelling of 156961 in words is "one hundred fifty-six thousand, nine hundred sixty-one".