1913391090 has 48 divisors (see below), whose sum is σ = 5357498328. Its totient is φ = 470988288.

The previous prime is 1913391071. The next prime is 1913391119. The reversal of 1913391090 is 901933191.

It can be written as a sum of positive squares in 4 ways, for example, as 1285437609 + 627953481 = 35853^2 + 25059^2 .

It is a super-2 number, since 2×1913391090² = 7322130926582776200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 816519 + ... + 818858.

Almost surely, 2^1913391090 is an apocalyptic number.

1913391090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1913391090 is an abundant number, since it is smaller than the sum of its proper divisors (3444107238).

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

1913391090 is a wasteful number, since it uses less digits than its factorization.

1913391090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635403 (or 1635400 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 36.

The square root of 1913391090 is about 43742.3260698377. The cubic root of 1913391090 is about 1241.4652921679.

The spelling of 1913391090 in words is "one billion, nine hundred thirteen million, three hundred ninety-one thousand, ninety".