231551501 has 2 divisors, whose sum is σ = 231551502. Its totient is φ = 231551500.

The previous prime is 231551497. The next prime is 231551521. The reversal of 231551501 is 105155132.

It is a happy number.

231551501 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., 164737225 + 66814276 = 12835^2 + 8174^2 .

It is a cyclic number.

It is not a de Polignac number, because 231551501 - 2² = 231551497 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231551521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115775750 + 115775751.

It is an arithmetic number, because the mean of its divisors is an integer number (115775751).

Almost surely, 2^231551501 is an apocalyptic number.

It is an amenable number.

231551501 is a deficient number, since it is larger than the sum of its proper divisors (1).

231551501 is an equidigital number, since it uses as much as digits as its factorization.

231551501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 231551501 is about 15216.8163884566. The cubic root of 231551501 is about 614.0671525191.

The spelling of 231551501 in words is "two hundred thirty-one million, five hundred fifty-one thousand, five hundred one".