31736989 has 2 divisors, whose sum is σ = 31736990. Its totient is φ = 31736988.

The previous prime is 31736981. The next prime is 31737031. The reversal of 31736989 is 98963713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31304025 + 432964 = 5595^2 + 658^2 .

It is an emirp because it is prime and its reverse (98963713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31736989 - 2³ = 31736981 is a prime.

It is a super-2 number, since 2×31736989² = 2014472941572242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31736981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15868494 + 15868495.

It is an arithmetic number, because the mean of its divisors is an integer number (15868495).

Almost surely, 2^31736989 is an apocalyptic number.

It is an amenable number.

31736989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31736989 is an equidigital number, since it uses as much as digits as its factorization.

31736989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 31736989 is about 5633.5591769325. The cubic root of 31736989 is about 316.6080165926.

The spelling of 31736989 in words is "thirty-one million, seven hundred thirty-six thousand, nine hundred eighty-nine".