31561452 has 72 divisors (see below), whose sum is σ = 90994176. Its totient is φ = 9137664.

The previous prime is 31561433. The next prime is 31561457. The reversal of 31561452 is 25416513.

It is a super-2 number, since 2×31561452² = 1992250504696608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31561457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5973 + ... + 9939.

It is an arithmetic number, because the mean of its divisors is an integer number (1263808).

Almost surely, 2^31561452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31561452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45497088).

31561452 is an abundant number, since it is smaller than the sum of its proper divisors (59432724).

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

31561452 is a wasteful number, since it uses less digits than its factorization.

31561452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007 (or 4002 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 31561452 is about 5617.9579920110. The cubic root of 31561452 is about 316.0232183976.

Adding to 31561452 its reverse (25416513), we get a palindrome (56977965).

The spelling of 31561452 in words is "thirty-one million, five hundred sixty-one thousand, four hundred fifty-two".