31494287 has 4 divisors (see below), whose sum is σ = 34357416. Its totient is φ = 28631160.

The previous prime is 31494263. The next prime is 31494293. The reversal of 31494287 is 78249413.

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 31494287 - 2²² = 27299983 is a prime.

It is a super-2 number, since 2×31494287² = 1983780227276738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31494287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31494247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431548 + ... + 1431569.

It is an arithmetic number, because the mean of its divisors is an integer number (8589354).

Almost surely, 2^31494287 is an apocalyptic number.

31494287 is a deficient number, since it is larger than the sum of its proper divisors (2863129).

31494287 is a wasteful number, since it uses less digits than its factorization.

31494287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863128.

The product of its digits is 48384, while the sum is 38.

The square root of 31494287 is about 5611.9771025905. The cubic root of 31494287 is about 315.7988859441.

The spelling of 31494287 in words is "thirty-one million, four hundred ninety-four thousand, two hundred eighty-seven".