231541493 has 2 divisors, whose sum is σ = 231541494. Its totient is φ = 231541492.

The previous prime is 231541459. The next prime is 231541507. The reversal of 231541493 is 394145132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117115684 + 114425809 = 10822^2 + 10697^2 .

It is a cyclic number.

It is not a de Polignac number, because 231541493 - 2⁸ = 231541237 is a prime.

It is a super-2 number, since 2×231541493² = 107222925961338098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231541403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115770746 + 115770747.

It is an arithmetic number, because the mean of its divisors is an integer number (115770747).

Almost surely, 2^231541493 is an apocalyptic number.

It is an amenable number.

231541493 is a deficient number, since it is larger than the sum of its proper divisors (1).

231541493 is an equidigital number, since it uses as much as digits as its factorization.

231541493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 231541493 is about 15216.4875381936. The cubic root of 231541493 is about 614.0583054267.

The spelling of 231541493 in words is "two hundred thirty-one million, five hundred forty-one thousand, four hundred ninety-three".