31220126 has 32 divisors (see below), whose sum is σ = 57894912. Its totient is φ = 12320640.

The previous prime is 31220093. The next prime is 31220159. The reversal of 31220126 is 62102213.

It is an interprime number because it is at equal distance from previous prime (31220093) and next prime (31220159).

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9791 + ... + 12581.

It is an arithmetic number, because the mean of its divisors is an integer number (1809216).

Almost surely, 2^31220126 is an apocalyptic number.

31220126 is a deficient number, since it is larger than the sum of its proper divisors (26674786).

31220126 is a wasteful number, since it uses less digits than its factorization.

31220126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 31220126 is about 5587.4972930642. The cubic root of 31220126 is about 314.8798601226.

Adding to 31220126 its reverse (62102213), we get a palindrome (93322339).

The spelling of 31220126 in words is "thirty-one million, two hundred twenty thousand, one hundred twenty-six".