1913712557 has 8 divisors (see below), whose sum is σ = 1997657112. Its totient is φ = 1831464000.

The previous prime is 1913712529. The next prime is 1913712571. The reversal of 1913712557 is 7552173191.

It can be written as a sum of positive squares in 4 ways, for example, as 444830281 + 1468882276 = 21091^2 + 38326^2 .

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

It is not a de Polignac number, because 1913712557 - 2¹⁰ = 1913711533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913711557) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 421694 + ... + 426207.

It is an arithmetic number, because the mean of its divisors is an integer number (249707139).

Almost surely, 2^1913712557 is an apocalyptic number.

It is an amenable number.

1913712557 is a deficient number, since it is larger than the sum of its proper divisors (83944555).

1913712557 is an equidigital number, since it uses as much as digits as its factorization.

1913712557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847999.

The product of its digits is 66150, while the sum is 41.

The square root of 1913712557 is about 43746.0004686143. Note that the first 3 decimals coincide. The cubic root of 1913712557 is about 1241.5348140719.

Subtracting from 1913712557 its sum of digits (41), we obtain a square (1913712516 = 43746²).

The spelling of 1913712557 in words is "one billion, nine hundred thirteen million, seven hundred twelve thousand, five hundred fifty-seven".