31540061 has 16 divisors (see below), whose sum is σ = 37822464. Its totient is φ = 25715184.

The previous prime is 31540031. The next prime is 31540063. The reversal of 31540061 is 16004513.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31540061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31540063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36116 + ... + 36978.

It is an arithmetic number, because the mean of its divisors is an integer number (2363904).

Almost surely, 2^31540061 is an apocalyptic number.

It is an amenable number.

31540061 is a deficient number, since it is larger than the sum of its proper divisors (6282403).

31540061 is a wasteful number, since it uses less digits than its factorization.

31540061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 31540061 is about 5616.0538637018. The cubic root of 31540061 is about 315.9518065958.

Adding to 31540061 its reverse (16004513), we get a palindrome (47544574).

The spelling of 31540061 in words is "thirty-one million, five hundred forty thousand, sixty-one".