1957990181 has 16 divisors (see below), whose sum is σ = 2376210816. Its totient is φ = 1574969856.

The previous prime is 1957990171. The next prime is 1957990189. The reversal of 1957990181 is 1810997591.

It is a cyclic number.

It is not a de Polignac number, because 1957990181 - 2⁶ = 1957990117 is a prime.

It is a super-2 number, since 2×1957990181² = 7667451097784825522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1957990189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17585 + ... + 65001.

It is an arithmetic number, because the mean of its divisors is an integer number (148513176).

Almost surely, 2^1957990181 is an apocalyptic number.

It is an amenable number.

1957990181 is a deficient number, since it is larger than the sum of its proper divisors (418220635).

1957990181 is a wasteful number, since it uses less digits than its factorization.

1957990181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47788.

The product of its (nonzero) digits is 204120, while the sum is 50.

The square root of 1957990181 is about 44249.1828286128. The cubic root of 1957990181 is about 1251.0370446727.

The spelling of 1957990181 in words is "one billion, nine hundred fifty-seven million, nine hundred ninety thousand, one hundred eighty-one".