156638941 has 2 divisors, whose sum is σ = 156638942. Its totient is φ = 156638940.

The previous prime is 156638929. The next prime is 156638959. The reversal of 156638941 is 149836651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88906041 + 67732900 = 9429^2 + 8230^2 .

It is a cyclic number.

It is not a de Polignac number, because 156638941 - 2²⁵ = 123084509 is a prime.

It is equal to p_8796508 and since 156638941 and 8796508 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156639941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78319470 + 78319471.

It is an arithmetic number, because the mean of its divisors is an integer number (78319471).

Almost surely, 2^156638941 is an apocalyptic number.

It is an amenable number.

156638941 is a deficient number, since it is larger than the sum of its proper divisors (1).

156638941 is an equidigital number, since it uses as much as digits as its factorization.

156638941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 156638941 is about 12515.5479704246. The cubic root of 156638941 is about 539.0552077949.

The spelling of 156638941 in words is "one hundred fifty-six million, six hundred thirty-eight thousand, nine hundred forty-one".