156472621 has 2 divisors, whose sum is σ = 156472622. Its totient is φ = 156472620.

The previous prime is 156472609. The next prime is 156472643. The reversal of 156472621 is 126274651.

156472621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80102500 + 76370121 = 8950^2 + 8739^2 .

It is an emirp because it is prime and its reverse (126274651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156472621 - 2⁷ = 156472493 is a prime.

It is a super-2 number, since 2×156472621² = 48967362245219282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156472601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78236310 + 78236311.

It is an arithmetic number, because the mean of its divisors is an integer number (78236311).

Almost surely, 2^156472621 is an apocalyptic number.

It is an amenable number.

156472621 is a deficient number, since it is larger than the sum of its proper divisors (1).

156472621 is an equidigital number, since it uses as much as digits as its factorization.

156472621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 156472621 is about 12508.9016704106. The cubic root of 156472621 is about 538.8643497350.

The spelling of 156472621 in words is "one hundred fifty-six million, four hundred seventy-two thousand, six hundred twenty-one".