31457663 has 4 divisors (see below), whose sum is σ = 32542440. Its totient is φ = 30372888.

The previous prime is 31457641. The next prime is 31457681. The reversal of 31457663 is 36675413.

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 31457663 - 2¹⁰ = 31456639 is a prime.

It is a super-2 number, since 2×31457663² = 1979169122843138, 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 (31457603) 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, 542345 + ... + 542402.

It is an arithmetic number, because the mean of its divisors is an integer number (8135610).

Almost surely, 2^31457663 is an apocalyptic number.

31457663 is a deficient number, since it is larger than the sum of its proper divisors (1084777).

31457663 is a wasteful number, since it uses less digits than its factorization.

31457663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084776.

The product of its digits is 45360, while the sum is 35.

The square root of 31457663 is about 5608.7131322613. The cubic root of 31457663 is about 315.6764266495.

The spelling of 31457663 in words is "thirty-one million, four hundred fifty-seven thousand, six hundred sixty-three".