150556921 has 2 divisors, whose sum is σ = 150556922. Its totient is φ = 150556920.

The previous prime is 150556867. The next prime is 150556927. The reversal of 150556921 is 129655051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149719696 + 837225 = 12236^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 150556921 - 2²¹ = 148459769 is a prime.

It is a super-2 number, since 2×150556921² = 45334772922000482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (150556927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75278460 + 75278461.

It is an arithmetic number, because the mean of its divisors is an integer number (75278461).

Almost surely, 2^150556921 is an apocalyptic number.

It is an amenable number.

150556921 is a deficient number, since it is larger than the sum of its proper divisors (1).

150556921 is an equidigital number, since it uses as much as digits as its factorization.

150556921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 34.

The square root of 150556921 is about 12270.1638538367. The cubic root of 150556921 is about 531.9860467537.

The spelling of 150556921 in words is "one hundred fifty million, five hundred fifty-six thousand, nine hundred twenty-one".