72556129 has 2 divisors, whose sum is σ = 72556130. Its totient is φ = 72556128.

The previous prime is 72556123. The next prime is 72556147. The reversal of 72556129 is 92165527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70224400 + 2331729 = 8380^2 + 1527^2 .

It is a cyclic number.

It is not a de Polignac number, because 72556129 - 2⁹ = 72555617 is a prime.

It is not a weakly prime, because it can be changed into another prime (72556123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36278064 + 36278065.

It is an arithmetic number, because the mean of its divisors is an integer number (36278065).

Almost surely, 2^72556129 is an apocalyptic number.

It is an amenable number.

72556129 is a deficient number, since it is larger than the sum of its proper divisors (1).

72556129 is an equidigital number, since it uses as much as digits as its factorization.

72556129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 37.

The square root of 72556129 is about 8517.9885536434. The cubic root of 72556129 is about 417.0851250593.

The spelling of 72556129 in words is "seventy-two million, five hundred fifty-six thousand, one hundred twenty-nine".