31899089 has 4 divisors (see below), whose sum is σ = 33775524. Its totient is φ = 30022656.

The previous prime is 31899083. The next prime is 31899151. The reversal of 31899089 is 98099813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17572864 + 14326225 = 4192^2 + 3785^2 .

It is a cyclic number.

It is not a de Polignac number, because 31899089 - 2¹⁶ = 31833553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31899083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938192 + ... + 938225.

It is an arithmetic number, because the mean of its divisors is an integer number (8443881).

Almost surely, 2^31899089 is an apocalyptic number.

It is an amenable number.

31899089 is a deficient number, since it is larger than the sum of its proper divisors (1876435).

31899089 is a wasteful number, since it uses less digits than its factorization.

31899089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876434.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 31899089 is about 5647.9278501057. The cubic root of 31899089 is about 317.1461376771.

The spelling of 31899089 in words is "thirty-one million, eight hundred ninety-nine thousand, eighty-nine".