31421952 has 80 divisors (see below), whose sum is σ = 93052080. Its totient is φ = 10469376.

The previous prime is 31421947. The next prime is 31421963. The reversal of 31421952 is 25912413.

31421952 is nontrivially palindromic in base 11.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12688 + ... + 14960.

It is an arithmetic number, because the mean of its divisors is an integer number (1163151).

Almost surely, 2^31421952 is an apocalyptic number.

31421952 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31421952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46526040).

31421952 is an abundant number, since it is smaller than the sum of its proper divisors (61630128).

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

31421952 is an equidigital number, since it uses as much as digits as its factorization.

31421952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300 (or 2278 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 31421952 is about 5605.5286994181. The cubic root of 31421952 is about 315.5569285870.

The spelling of 31421952 in words is "thirty-one million, four hundred twenty-one thousand, nine hundred fifty-two".