1955291690 has 16 divisors (see below), whose sum is σ = 3839482080. Its totient is φ = 711015120.

The previous prime is 1955291609. The next prime is 1955291707. The reversal of 1955291690 is 961925591.

It is a super-2 number, since 2×1955291690² = 7646331185966112200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8887580 + ... + 8887799.

It is an arithmetic number, because the mean of its divisors is an integer number (239967630).

Almost surely, 2^1955291690 is an apocalyptic number.

1955291690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1955291690 is a deficient number, since it is larger than the sum of its proper divisors (1884190390).

1955291690 is a wasteful number, since it uses less digits than its factorization.

1955291690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17775397.

The product of its (nonzero) digits is 218700, while the sum is 47.

The square root of 1955291690 is about 44218.6803285670. The cubic root of 1955291690 is about 1250.4620563821.

The spelling of 1955291690 in words is "one billion, nine hundred fifty-five million, two hundred ninety-one thousand, six hundred ninety".