156457121 has 2 divisors, whose sum is σ = 156457122. Its totient is φ = 156457120.

The previous prime is 156457111. The next prime is 156457141. The reversal of 156457121 is 121754651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114725521 + 41731600 = 10711^2 + 6460^2 .

It is an emirp because it is prime and its reverse (121754651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156457121 - 2⁶ = 156457057 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (156457111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78228560 + 78228561.

It is an arithmetic number, because the mean of its divisors is an integer number (78228561).

Almost surely, 2^156457121 is an apocalyptic number.

It is an amenable number.

156457121 is a deficient number, since it is larger than the sum of its proper divisors (1).

156457121 is an equidigital number, since it uses as much as digits as its factorization.

156457121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 156457121 is about 12508.2820962753. The cubic root of 156457121 is about 538.8465560508.

It can be divided in two parts, 1564 and 57121, that added together give a palindrome (58685).

The spelling of 156457121 in words is "one hundred fifty-six million, four hundred fifty-seven thousand, one hundred twenty-one".