156047921 has 2 divisors, whose sum is σ = 156047922. Its totient is φ = 156047920.

The previous prime is 156047917. The next prime is 156047951. The reversal of 156047921 is 129740651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89397025 + 66650896 = 9455^2 + 8164^2 .

It is a cyclic number.

It is not a de Polignac number, because 156047921 - 2² = 156047917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (156047911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78023960 + 78023961.

It is an arithmetic number, because the mean of its divisors is an integer number (78023961).

Almost surely, 2^156047921 is an apocalyptic number.

It is an amenable number.

156047921 is a deficient number, since it is larger than the sum of its proper divisors (1).

156047921 is an equidigital number, since it uses as much as digits as its factorization.

156047921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 156047921 is about 12491.9142248096. The cubic root of 156047921 is about 538.3763771321.

The spelling of 156047921 in words is "one hundred fifty-six million, forty-seven thousand, nine hundred twenty-one".