31723493 has 2 divisors, whose sum is σ = 31723494. Its totient is φ = 31723492.

The previous prime is 31723481. The next prime is 31723499. The reversal of 31723493 is 39432713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22591009 + 9132484 = 4753^2 + 3022^2 .

It is a cyclic number.

It is not a de Polignac number, because 31723493 - 2¹⁶ = 31657957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31723499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15861746 + 15861747.

It is an arithmetic number, because the mean of its divisors is an integer number (15861747).

Almost surely, 2^31723493 is an apocalyptic number.

It is an amenable number.

31723493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31723493 is an equidigital number, since it uses as much as digits as its factorization.

31723493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 32.

The square root of 31723493 is about 5632.3612277623. The cubic root of 31723493 is about 316.5631315573.

The spelling of 31723493 in words is "thirty-one million, seven hundred twenty-three thousand, four hundred ninety-three".