31424643 has 6 divisors (see below), whose sum is σ = 45391164. Its totient is φ = 20949756.

The previous prime is 31424629. The next prime is 31424663. The reversal of 31424643 is 34642413.

31424643 is a `hidden beast` number, since 3 + 14 + 2 + 4 + 643 = 666.

It is not a de Polignac number, because 31424643 - 2⁵ = 31424611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31424663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1745805 + ... + 1745822.

It is an arithmetic number, because the mean of its divisors is an integer number (7565194).

Almost surely, 2^31424643 is an apocalyptic number.

31424643 is a deficient number, since it is larger than the sum of its proper divisors (13966521).

31424643 is a wasteful number, since it uses less digits than its factorization.

31424643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491633 (or 3491630 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 31424643 is about 5605.7687251616. The cubic root of 31424643 is about 315.5659365087.

The spelling of 31424643 in words is "thirty-one million, four hundred twenty-four thousand, six hundred forty-three".