31423747 has 2 divisors, whose sum is σ = 31423748. Its totient is φ = 31423746.

The previous prime is 31423729. The next prime is 31423757. The reversal of 31423747 is 74732413.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31423747 - 2¹¹ = 31421699 is a prime.

It is not a weakly prime, because it can be changed into another prime (31423757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711873 + 15711874.

It is an arithmetic number, because the mean of its divisors is an integer number (15711874).

Almost surely, 2^31423747 is an apocalyptic number.

31423747 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423747 is an equidigital number, since it uses as much as digits as its factorization.

31423747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 31.

The square root of 31423747 is about 5605.6888069175. The cubic root of 31423747 is about 315.5629372727.

It can be divided in two parts, 3142 and 3747, that added together give a square (6889 = 83²).

The spelling of 31423747 in words is "thirty-one million, four hundred twenty-three thousand, seven hundred forty-seven".