156639941 has 2 divisors, whose sum is σ = 156639942. Its totient is φ = 156639940.

The previous prime is 156639881. The next prime is 156639943. The reversal of 156639941 is 149936651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79727041 + 76912900 = 8929^2 + 8770^2 .

It is a cyclic number.

It is not a de Polignac number, because 156639941 - 2¹⁴ = 156623557 is a prime.

It is a super-2 number, since 2×156639941² = 49072142232966962, which contains 22 as substring.

Together with 156639943, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 156639892 and 156639901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156639943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78319970 + 78319971.

It is an arithmetic number, because the mean of its divisors is an integer number (78319971).

Almost surely, 2^156639941 is an apocalyptic number.

It is an amenable number.

156639941 is a deficient number, since it is larger than the sum of its proper divisors (1).

156639941 is an equidigital number, since it uses as much as digits as its factorization.

156639941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 44.

The square root of 156639941 is about 12515.5879206692. The cubic root of 156639941 is about 539.0563549215.

The spelling of 156639941 in words is "one hundred fifty-six million, six hundred thirty-nine thousand, nine hundred forty-one".