31423529 has 2 divisors, whose sum is σ = 31423530. Its totient is φ = 31423528.

The previous prime is 31423523. The next prime is 31423573. The reversal of 31423529 is 92532413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30858025 + 565504 = 5555^2 + 752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31423529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31423523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711764 + 15711765.

It is an arithmetic number, because the mean of its divisors is an integer number (15711765).

Almost surely, 2^31423529 is an apocalyptic number.

It is an amenable number.

31423529 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423529 is an equidigital number, since it uses as much as digits as its factorization.

31423529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 31423529 is about 5605.6693623509. The cubic root of 31423529 is about 315.5622075392.

The spelling of 31423529 in words is "thirty-one million, four hundred twenty-three thousand, five hundred twenty-nine".