31801423 has 2 divisors, whose sum is σ = 31801424. Its totient is φ = 31801422.

The previous prime is 31801403. The next prime is 31801439. The reversal of 31801423 is 32410813.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31801423 is a prime.

It is a super-2 number, since 2×31801423² = 2022661009649858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31801394 and 31801403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31801403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15900711 + 15900712.

It is an arithmetic number, because the mean of its divisors is an integer number (15900712).

Almost surely, 2^31801423 is an apocalyptic number.

31801423 is a deficient number, since it is larger than the sum of its proper divisors (1).

31801423 is an equidigital number, since it uses as much as digits as its factorization.

31801423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 31801423 is about 5639.2750420599. The cubic root of 31801423 is about 316.8221361549.

The spelling of 31801423 in words is "thirty-one million, eight hundred one thousand, four hundred twenty-three".