31138019388 has 36 divisors (see below), whose sum is σ = 89954278960. Its totient is φ = 8896576896.

The previous prime is 31138019377. The next prime is 31138019431. The reversal of 31138019388 is 88391083113.

31138019388 is a `hidden beast` number, since 3 + 1 + 1 + 380 + 193 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61781533 + ... + 61782036.

Almost surely, 2^31138019388 is an apocalyptic number.

It is an amenable number.

31138019388 is an abundant number, since it is smaller than the sum of its proper divisors (58816259572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31138019388 is a wasteful number, since it uses less digits than its factorization.

31138019388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123563586 (or 123563581 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 31138019388 in words is "thirty-one billion, one hundred thirty-eight million, nineteen thousand, three hundred eighty-eight".