31540121430 has 64 divisors (see below), whose sum is σ = 77160999168. Its totient is φ = 8249513600.

The previous prime is 31540121419. The next prime is 31540121461. The reversal of 31540121430 is 3412104513.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31540121430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 275569 + ... + 372851.

It is an arithmetic number, because the mean of its divisors is an integer number (1205640612).

Almost surely, 2^31540121430 is an apocalyptic number.

31540121430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31540121430 is an abundant number, since it is smaller than the sum of its proper divisors (45620877738).

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

31540121430 is a wasteful number, since it uses less digits than its factorization.

31540121430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97501.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 31540121430 its reverse (3412104513), we get a palindrome (34952225943).

The spelling of 31540121430 in words is "thirty-one billion, five hundred forty million, one hundred twenty-one thousand, four hundred thirty".