31101972 has 24 divisors (see below), whose sum is σ = 79168992. Its totient is φ = 9424800.

The previous prime is 31101971. The next prime is 31101977. The reversal of 31101972 is 27910113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31101971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117679 + ... + 117942.

It is an arithmetic number, because the mean of its divisors is an integer number (3298708).

Almost surely, 2^31101972 is an apocalyptic number.

It is an amenable number.

31101972 is an abundant number, since it is smaller than the sum of its proper divisors (48067020).

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

31101972 is a wasteful number, since it uses less digits than its factorization.

31101972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235639 (or 235637 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 31101972 is about 5576.9142005234. The cubic root of 31101972 is about 314.4821321982.

The spelling of 31101972 in words is "thirty-one million, one hundred one thousand, nine hundred seventy-two".