31601489 has 2 divisors, whose sum is σ = 31601490. Its totient is φ = 31601488.

The previous prime is 31601473. The next prime is 31601509. The reversal of 31601489 is 98410613.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29593600 + 2007889 = 5440^2 + 1417^2 .

It is a cyclic number.

It is not a de Polignac number, because 31601489 - 2⁴ = 31601473 is a prime.

It is a super-3 number, since 3×31601489³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31603489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15800744 + 15800745.

It is an arithmetic number, because the mean of its divisors is an integer number (15800745).

Almost surely, 2^31601489 is an apocalyptic number.

It is an amenable number.

31601489 is a deficient number, since it is larger than the sum of its proper divisors (1).

31601489 is an equidigital number, since it uses as much as digits as its factorization.

31601489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 31601489 is about 5621.5201680684. The cubic root of 31601489 is about 316.1567914161.

The spelling of 31601489 in words is "thirty-one million, six hundred one thousand, four hundred eighty-nine".