31201644540 has 96 divisors (see below), whose sum is σ = 95470389504. Its totient is φ = 7551055360.

The previous prime is 31201644521. The next prime is 31201644541. The reversal of 31201644540 is 4544610213.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31201644498 and 31201644507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201644541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 347152 + ... + 427688.

It is an arithmetic number, because the mean of its divisors is an integer number (994483224).

Almost surely, 2^31201644540 is an apocalyptic number.

31201644540 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 31201644540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47735194752).

31201644540 is an abundant number, since it is smaller than the sum of its proper divisors (64268744964).

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

31201644540 is a wasteful number, since it uses less digits than its factorization.

31201644540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81147 (or 81145 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 31201644540 in words is "thirty-one billion, two hundred one million, six hundred forty-four thousand, five hundred forty".