31420553 has 12 divisors (see below), whose sum is σ = 33377664. Its totient is φ = 29521800.

The previous prime is 31420517. The next prime is 31420559. The reversal of 31420553 is 35502413.

It is not a de Polignac number, because 31420553 - 2⁶ = 31420489 is a prime.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31420559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115808 + ... + 116078.

It is an arithmetic number, because the mean of its divisors is an integer number (2781472).

Almost surely, 2^31420553 is an apocalyptic number.

It is an amenable number.

31420553 is a deficient number, since it is larger than the sum of its proper divisors (1957111).

31420553 is an equidigital number, since it uses as much as digits as its factorization.

31420553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 31420553 is about 5605.4039105135. The cubic root of 31420553 is about 315.5522453356.

Adding to 31420553 its reverse (35502413), we get a palindrome (66922966).

The spelling of 31420553 in words is "thirty-one million, four hundred twenty thousand, five hundred fifty-three".