31125343540 has 24 divisors (see below), whose sum is σ = 67471713792. Its totient is φ = 12048519840.

The previous prime is 31125343499. The next prime is 31125343541. The reversal of 31125343540 is 4534352113.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31125343541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25100464 + ... + 25101703.

It is an arithmetic number, because the mean of its divisors is an integer number (2811321408).

Almost surely, 2^31125343540 is an apocalyptic number.

It is an amenable number.

31125343540 is an abundant number, since it is smaller than the sum of its proper divisors (36346370252).

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

31125343540 is a wasteful number, since it uses less digits than its factorization.

31125343540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50202207 (or 50202205 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 31125343540 its reverse (4534352113), we get a palindrome (35659695653).

The spelling of 31125343540 in words is "thirty-one billion, one hundred twenty-five million, three hundred forty-three thousand, five hundred forty".