189023521 has 2 divisors, whose sum is σ = 189023522. Its totient is φ = 189023520.

The previous prime is 189023467. The next prime is 189023531. The reversal of 189023521 is 125320981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101787921 + 87235600 = 10089^2 + 9340^2 .

It is a cyclic number.

It is not a de Polignac number, because 189023521 - 2¹¹ = 189021473 is a prime.

It is not a weakly prime, because it can be changed into another prime (189023531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94511760 + 94511761.

It is an arithmetic number, because the mean of its divisors is an integer number (94511761).

Almost surely, 2^189023521 is an apocalyptic number.

It is an amenable number.

189023521 is a deficient number, since it is larger than the sum of its proper divisors (1).

189023521 is an equidigital number, since it uses as much as digits as its factorization.

189023521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 189023521 is about 13748.5825087534. The cubic root of 189023521 is about 573.9031602222.

The spelling of 189023521 in words is "one hundred eighty-nine million, twenty-three thousand, five hundred twenty-one".