31650989 has 2 divisors, whose sum is σ = 31650990. Its totient is φ = 31650988.

The previous prime is 31650929. The next prime is 31651049. The reversal of 31650989 is 98905613.

It is a balanced prime because it is at equal distance from previous prime (31650929) and next prime (31651049).

It can be written as a sum of positive squares in only one way, i.e., 21696964 + 9954025 = 4658^2 + 3155^2 .

It is an emirp because it is prime and its reverse (98905613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31650989 - 2¹⁶ = 31585453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31650929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15825494 + 15825495.

It is an arithmetic number, because the mean of its divisors is an integer number (15825495).

Almost surely, 2^31650989 is an apocalyptic number.

It is an amenable number.

31650989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31650989 is an equidigital number, since it uses as much as digits as its factorization.

31650989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 31650989 is about 5625.9211690176. The cubic root of 31650989 is about 316.3217793920.

The spelling of 31650989 in words is "thirty-one million, six hundred fifty thousand, nine hundred eighty-nine".