31520089 has 2 divisors, whose sum is σ = 31520090. Its totient is φ = 31520088.

The previous prime is 31520059. The next prime is 31520117. The reversal of 31520089 is 98002513.

It is an a-pointer prime, because the next prime (31520117) can be obtained adding 31520089 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27910089 + 3610000 = 5283^2 + 1900^2 .

It is a cyclic number.

It is not a de Polignac number, because 31520089 - 2¹⁹ = 30995801 is a prime.

It is not a weakly prime, because it can be changed into another prime (31520009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760044 + 15760045.

It is an arithmetic number, because the mean of its divisors is an integer number (15760045).

Almost surely, 2^31520089 is an apocalyptic number.

It is an amenable number.

31520089 is a deficient number, since it is larger than the sum of its proper divisors (1).

31520089 is an equidigital number, since it uses as much as digits as its factorization.

31520089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 31520089 is about 5614.2754652760. The cubic root of 31520089 is about 315.8851028368.

The spelling of 31520089 in words is "thirty-one million, five hundred twenty thousand, eighty-nine".