31022140 has 12 divisors (see below), whose sum is σ = 65146536. Its totient is φ = 12408848.

The previous prime is 31022137. The next prime is 31022149. The reversal of 31022140 is 4122013.

It is a self number, because there is not a number n which added to its sum of digits gives 31022140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31022149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775534 + ... + 775573.

It is an arithmetic number, because the mean of its divisors is an integer number (5428878).

Almost surely, 2^31022140 is an apocalyptic number.

It is an amenable number.

31022140 is an abundant number, since it is smaller than the sum of its proper divisors (34124396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31022140 is a wasteful number, since it uses less digits than its factorization.

31022140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551116 (or 1551114 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 31022140 is about 5569.7522386548. The cubic root of 31022140 is about 314.2128325690.

Adding to 31022140 its reverse (4122013), we get a palindrome (35144153).

The spelling of 31022140 in words is "thirty-one million, twenty-two thousand, one hundred forty".