1813091057 has 8 divisors (see below), whose sum is σ = 1863280296. Its totient is φ = 1762964352.

The previous prime is 1813091047. The next prime is 1813091069. The reversal of 1813091057 is 7501903181.

It can be written as a sum of positive squares in 4 ways, for example, as 180203776 + 1632887281 = 13424^2 + 40409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1813091057 - 2⁴ = 1813091041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813091047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46523 + ... + 76095.

It is an arithmetic number, because the mean of its divisors is an integer number (232910037).

Almost surely, 2^1813091057 is an apocalyptic number.

It is an amenable number.

1813091057 is a deficient number, since it is larger than the sum of its proper divisors (50189239).

1813091057 is a wasteful number, since it uses less digits than its factorization.

1813091057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31267.

The product of its (nonzero) digits is 7560, while the sum is 35.

The square root of 1813091057 is about 42580.4069614183. The cubic root of 1813091057 is about 1219.3822584796.

The spelling of 1813091057 in words is "one billion, eight hundred thirteen million, ninety-one thousand, fifty-seven".