31142031 has 4 divisors (see below), whose sum is σ = 41522712. Its totient is φ = 20761352.

The previous prime is 31142021. The next prime is 31142039. The reversal of 31142031 is 13024113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13024113 = 3 ⋅4341371.

It is a cyclic number.

It is not a de Polignac number, because 31142031 - 2⁶ = 31141967 is a prime.

It is a super-2 number, since 2×31142031² = 1939652189609922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31142031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31142039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5190336 + ... + 5190341.

It is an arithmetic number, because the mean of its divisors is an integer number (10380678).

Almost surely, 2^31142031 is an apocalyptic number.

31142031 is a deficient number, since it is larger than the sum of its proper divisors (10380681).

31142031 is a wasteful number, since it uses less digits than its factorization.

31142031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10380680.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 31142031 is about 5580.5045470817. The cubic root of 31142031 is about 314.6170907894.

Adding to 31142031 its reverse (13024113), we get a palindrome (44166144).

The spelling of 31142031 in words is "thirty-one million, one hundred forty-two thousand, thirty-one".