31868429 has 4 divisors (see below), whose sum is σ = 32184060. Its totient is φ = 31552800.

The previous prime is 31868411. The next prime is 31868449. The reversal of 31868429 is 92486813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92486813 = 19 ⋅4867727.

It can be written as a sum of positive squares in 2 ways, for example, as 14645929 + 17222500 = 3827^2 + 4150^2 .

It is a cyclic number.

It is not a de Polignac number, because 31868429 - 2⁸ = 31868173 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 (31868449) 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, 157664 + ... + 157865.

It is an arithmetic number, because the mean of its divisors is an integer number (8046015).

Almost surely, 2^31868429 is an apocalyptic number.

It is an amenable number.

31868429 is a deficient number, since it is larger than the sum of its proper divisors (315631).

31868429 is a wasteful number, since it uses less digits than its factorization.

31868429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315630.

The product of its digits is 82944, while the sum is 41.

The square root of 31868429 is about 5645.2129277823. The cubic root of 31868429 is about 317.0444961373.

The spelling of 31868429 in words is "thirty-one million, eight hundred sixty-eight thousand, four hundred twenty-nine".