1931990136 has 16 divisors (see below), whose sum is σ = 4829975400. Its totient is φ = 643996704.

The previous prime is 1931990119. The next prime is 1931990147. The reversal of 1931990136 is 6310991391.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40249771 + ... + 40249818.

Almost surely, 2^1931990136 is an apocalyptic number.

It is an amenable number.

1931990136 is an abundant number, since it is smaller than the sum of its proper divisors (2897985264).

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

1931990136 is a wasteful number, since it uses less digits than its factorization.

1931990136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80499598 (or 80499594 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 1931990136 is about 43954.4097446434. The cubic root of 1931990136 is about 1245.4748673203.

The spelling of 1931990136 in words is "one billion, nine hundred thirty-one million, nine hundred ninety thousand, one hundred thirty-six".