31397122 has 4 divisors (see below), whose sum is σ = 47095686. Its totient is φ = 15698560.

The previous prime is 31397083. The next prime is 31397129. The reversal of 31397122 is 22179313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 31371201 + 25921 = 5601^2 + 161^2 .

It is not an unprimeable number, because it can be changed into a prime (31397129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7849279 + ... + 7849282.

Almost surely, 2^31397122 is an apocalyptic number.

31397122 is a deficient number, since it is larger than the sum of its proper divisors (15698564).

31397122 is a wasteful number, since it uses less digits than its factorization.

31397122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15698563.

The product of its digits is 2268, while the sum is 28.

The square root of 31397122 is about 5603.3134840021. The cubic root of 31397122 is about 315.4737877381.

The spelling of 31397122 in words is "thirty-one million, three hundred ninety-seven thousand, one hundred twenty-two".