1913097561 has 8 divisors (see below), whose sum is σ = 2552589984. Its totient is φ = 1274501760.

The previous prime is 1913097559. The next prime is 1913097587. The reversal of 1913097561 is 1657903191.

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

It is not a de Polignac number, because 1913097561 - 2¹ = 1913097559 is a prime.

It is a super-3 number, since 3×1913097561³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1913097551) 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, 219160 + ... + 227721.

It is an arithmetic number, because the mean of its divisors is an integer number (319073748).

Almost surely, 2^1913097561 is an apocalyptic number.

It is an amenable number.

1913097561 is a deficient number, since it is larger than the sum of its proper divisors (639492423).

1913097561 is a wasteful number, since it uses less digits than its factorization.

1913097561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448311.

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 1913097561 is about 43738.9707354894. The cubic root of 1913097561 is about 1241.4018054604.

The spelling of 1913097561 in words is "one billion, nine hundred thirteen million, ninety-seven thousand, five hundred sixty-one".