31440406163 has 4 divisors (see below), whose sum is σ = 32807380368. Its totient is φ = 30073431960.

The previous prime is 31440406157. The next prime is 31440406201. The reversal of 31440406163 is 36160404413.

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

It is not a de Polignac number, because 31440406163 - 2²⁸ = 31171970707 is a prime.

It is a super-3 number, since 3×31440406163³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31440400163) 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, 683487068 + ... + 683487113.

It is an arithmetic number, because the mean of its divisors is an integer number (8201845092).

Almost surely, 2^31440406163 is an apocalyptic number.

31440406163 is a deficient number, since it is larger than the sum of its proper divisors (1366974205).

31440406163 is a wasteful number, since it uses less digits than its factorization.

31440406163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366974204.

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 31440406163 in words is "thirty-one billion, four hundred forty million, four hundred six thousand, one hundred sixty-three".