31042539 has 12 divisors (see below), whose sum is σ = 48915672. Its totient is φ = 18813600.

The previous prime is 31042537. The next prime is 31042541. The reversal of 31042539 is 93524013.

It is an interprime number because it is at equal distance from previous prime (31042537) and next prime (31042541).

It is not a de Polignac number, because 31042539 - 2¹ = 31042537 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (31042537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156682 + ... + 156879.

It is an arithmetic number, because the mean of its divisors is an integer number (4076306).

Almost surely, 2^31042539 is an apocalyptic number.

31042539 is a deficient number, since it is larger than the sum of its proper divisors (17873133).

31042539 is a wasteful number, since it uses less digits than its factorization.

31042539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313578 (or 313575 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 31042539 is about 5571.5831681848. The cubic root of 31042539 is about 314.2816890177.

It can be divided in two parts, 310 and 42539, that added together give a square (42849 = 207²).

The spelling of 31042539 in words is "thirty-one million, forty-two thousand, five hundred thirty-nine".