31201144 has 32 divisors (see below), whose sum is σ = 64476720. Its totient is φ = 14063616.

The previous prime is 31201139. The next prime is 31201169. The reversal of 31201144 is 44110213.

It is a super-2 number, since 2×31201144² = 1947022773817472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 984 + ... + 7960.

Almost surely, 2^31201144 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 31201144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32238360).

31201144 is an abundant number, since it is smaller than the sum of its proper divisors (33275576).

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

31201144 is a wasteful number, since it uses less digits than its factorization.

31201144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039 (or 7035 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 31201144 is about 5585.7984209959. The cubic root of 31201144 is about 314.8160309837.

Adding to 31201144 its reverse (44110213), we get a palindrome (75311357).

It can be divided in two parts, 31201 and 144, that multiplied together give a palindrome (4492944).

The spelling of 31201144 in words is "thirty-one million, two hundred one thousand, one hundred forty-four".