31690122 has 32 divisors (see below), whose sum is σ = 65746944. Its totient is φ = 10172400.

The previous prime is 31690121. The next prime is 31690123. The reversal of 31690122 is 22109613.

It is an interprime number because it is at equal distance from previous prime (31690121) and next prime (31690123).

It is a junction number, because it is equal to n+sod(n) for n = 31690092 and 31690101.

It is not an unprimeable number, because it can be changed into a prime (31690121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64297 + ... + 64787.

It is an arithmetic number, because the mean of its divisors is an integer number (2054592).

Almost surely, 2^31690122 is an apocalyptic number.

31690122 is an abundant number, since it is smaller than the sum of its proper divisors (34056822).

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

31690122 is a wasteful number, since it uses less digits than its factorization.

31690122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 31690122 is about 5629.3980139976. The cubic root of 31690122 is about 316.4520915084.

Adding to 31690122 its reverse (22109613), we get a palindrome (53799735).

The spelling of 31690122 in words is "thirty-one million, six hundred ninety thousand, one hundred twenty-two".