31494487 has 4 divisors (see below), whose sum is σ = 31788936. Its totient is φ = 31200040.

The previous prime is 31494479. The next prime is 31494497. The reversal of 31494487 is 78449413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31494487 - 2³ = 31494479 is a prime.

It is a super-2 number, since 2×31494487² = 1983805422786338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31494427) 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, 147064 + ... + 147277.

It is an arithmetic number, because the mean of its divisors is an integer number (7947234).

Almost surely, 2^31494487 is an apocalyptic number.

31494487 is a deficient number, since it is larger than the sum of its proper divisors (294449).

31494487 is a wasteful number, since it uses less digits than its factorization.

31494487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294448.

The product of its digits is 96768, while the sum is 40.

The square root of 31494487 is about 5611.9949215943. The cubic root of 31494487 is about 315.7995544214.

The spelling of 31494487 in words is "thirty-one million, four hundred ninety-four thousand, four hundred eighty-seven".