31866989949 has 10 divisors (see below), whose sum is σ = 47603775230. Its totient is φ = 21244659912.

The previous prime is 31866989939. The next prime is 31866989953. The reversal of 31866989949 is 94998966813.

It can be written as a sum of positive squares in only one way, i.e., 20003859225 + 11863130724 = 141435^2 + 108918^2 .

It is not a de Polignac number, because 31866989949 - 2¹⁶ = 31866924413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31866989939) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 196709734 + ... + 196709895.

It is an arithmetic number, because the mean of its divisors is an integer number (4760377523).

Almost surely, 2^31866989949 is an apocalyptic number.

It is an amenable number.

31866989949 is a deficient number, since it is larger than the sum of its proper divisors (15736785281).

31866989949 is an equidigital number, since it uses as much as digits as its factorization.

31866989949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393419641 (or 393419632 counting only the distinct ones).

The product of its digits is 181398528, while the sum is 72.

The spelling of 31866989949 in words is "thirty-one billion, eight hundred sixty-six million, nine hundred eighty-nine thousand, nine hundred forty-nine".