156624421 has 2 divisors, whose sum is σ = 156624422. Its totient is φ = 156624420.

The previous prime is 156624407. The next prime is 156624427. The reversal of 156624421 is 124426651.

It is a happy number.

156624421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93993025 + 62631396 = 9695^2 + 7914^2 .

It is an emirp because it is prime and its reverse (124426651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156624421 - 2¹⁷ = 156493349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156624427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78312210 + 78312211.

It is an arithmetic number, because the mean of its divisors is an integer number (78312211).

Almost surely, 2^156624421 is an apocalyptic number.

It is an amenable number.

156624421 is a deficient number, since it is larger than the sum of its proper divisors (1).

156624421 is an equidigital number, since it uses as much as digits as its factorization.

156624421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

The square root of 156624421 is about 12514.9678785045. The cubic root of 156624421 is about 539.0385509674.

The spelling of 156624421 in words is "one hundred fifty-six million, six hundred twenty-four thousand, four hundred twenty-one".