233661431 has 2 divisors, whose sum is σ = 233661432. Its totient is φ = 233661430.

The previous prime is 233661427. The next prime is 233661451. The reversal of 233661431 is 134166332.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 233661431 - 2² = 233661427 is a prime.

It is a super-2 number, since 2×233661431² = 109195328673935522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 233661394 and 233661403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (233661451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116830715 + 116830716.

It is an arithmetic number, because the mean of its divisors is an integer number (116830716).

Almost surely, 2^233661431 is an apocalyptic number.

233661431 is a deficient number, since it is larger than the sum of its proper divisors (1).

233661431 is an equidigital number, since it uses as much as digits as its factorization.

233661431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 29.

The square root of 233661431 is about 15285.9880609662. The cubic root of 233661431 is about 615.9266713958.

The spelling of 233661431 in words is "two hundred thirty-three million, six hundred sixty-one thousand, four hundred thirty-one".