31151489 has 2 divisors, whose sum is σ = 31151490. Its totient is φ = 31151488.

The previous prime is 31151473. The next prime is 31151543. The reversal of 31151489 is 98415113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30991489 + 160000 = 5567^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 31151489 - 2⁴ = 31151473 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31151389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15575744 + 15575745.

It is an arithmetic number, because the mean of its divisors is an integer number (15575745).

Almost surely, 2^31151489 is an apocalyptic number.

It is an amenable number.

31151489 is a deficient number, since it is larger than the sum of its proper divisors (1).

31151489 is an equidigital number, since it uses as much as digits as its factorization.

31151489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 32.

The square root of 31151489 is about 5581.3518971661. The cubic root of 31151489 is about 314.6489378587.

The spelling of 31151489 in words is "thirty-one million, one hundred fifty-one thousand, four hundred eighty-nine".