31606431 has 8 divisors (see below), whose sum is σ = 42735744. Its totient is φ = 20774040.

The previous prime is 31606429. The next prime is 31606469. The reversal of 31606431 is 13460613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31606431 - 2¹ = 31606429 is a prime.

It is a super-2 number, since 2×31606431² = 1997932961115522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31606411) 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, 73981 + ... + 74406.

It is an arithmetic number, because the mean of its divisors is an integer number (5341968).

Almost surely, 2^31606431 is an apocalyptic number.

31606431 is a deficient number, since it is larger than the sum of its proper divisors (11129313).

31606431 is a wasteful number, since it uses less digits than its factorization.

31606431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148461.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 31606431 is about 5621.9597117020. The cubic root of 31606431 is about 316.1732712875.

It can be divided in two parts, 3160 and 6431, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 31606431 in words is "thirty-one million, six hundred six thousand, four hundred thirty-one".