31220497 has 12 divisors (see below), whose sum is σ = 39620016. Its totient is φ = 24327240.

The previous prime is 31220447. The next prime is 31220507. The reversal of 31220497 is 79402213.

It is not a de Polignac number, because 31220497 - 2¹⁹ = 30696209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31220447) 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, 28423 + ... + 29500.

It is an arithmetic number, because the mean of its divisors is an integer number (3301668).

Almost surely, 2^31220497 is an apocalyptic number.

It is an amenable number.

31220497 is a deficient number, since it is larger than the sum of its proper divisors (8399519).

31220497 is a wasteful number, since it uses less digits than its factorization.

31220497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57948 (or 57941 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 31220497 is about 5587.5304920868. The cubic root of 31220497 is about 314.8811073946.

The spelling of 31220497 in words is "thirty-one million, two hundred twenty thousand, four hundred ninety-seven".