31222130 has 32 divisors (see below), whose sum is σ = 59780160. Its totient is φ = 11707200.

The previous prime is 31222129. The next prime is 31222133. The reversal of 31222130 is 3122213.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31222133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18377 + ... + 20003.

It is an arithmetic number, because the mean of its divisors is an integer number (1868130).

Almost surely, 2^31222130 is an apocalyptic number.

31222130 is a deficient number, since it is larger than the sum of its proper divisors (28558030).

31222130 is a wasteful number, since it uses less digits than its factorization.

31222130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31222130 is about 5587.6766191325. The cubic root of 31222130 is about 314.8865972910.

Adding to 31222130 its reverse (3122213), we get a palindrome (34344343).

The spelling of 31222130 in words is "thirty-one million, two hundred twenty-two thousand, one hundred thirty".