31201431240 has 192 divisors, whose sum is σ = 109527465600. Its totient is φ = 6965554176.

The previous prime is 31201431223. The next prime is 31201431269. The reversal of 31201431240 is 4213410213.

It is a super-2 number, since 2×31201431240² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1543116 + ... + 1563204.

It is an arithmetic number, because the mean of its divisors is an integer number (570455550).

Almost surely, 2^31201431240 is an apocalyptic number.

31201431240 is a gapful number since it is divisible by the number (30) 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 31201431240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54763732800).

31201431240 is an abundant number, since it is smaller than the sum of its proper divisors (78326034360).

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

31201431240 is a wasteful number, since it uses less digits than its factorization.

31201431240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20196 (or 20149 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31201431240 its reverse (4213410213), we get a palindrome (35414841453).

The spelling of 31201431240 in words is "thirty-one billion, two hundred one million, four hundred thirty-one thousand, two hundred forty".