1157815491 has 8 divisors (see below), whose sum is σ = 1764290304. Its totient is φ = 661608840.

The previous prime is 1157815411. The next prime is 1157815513. The reversal of 1157815491 is 1945187511.

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

It is not a de Polignac number, because 1157815491 - 2¹¹ = 1157813443 is a prime.

It is a super-2 number, since 2×1157815491² = 2681073422399142162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1157815411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27567015 + ... + 27567056.

It is an arithmetic number, because the mean of its divisors is an integer number (220536288).

Almost surely, 2^1157815491 is an apocalyptic number.

1157815491 is a deficient number, since it is larger than the sum of its proper divisors (606474813).

1157815491 is an equidigital number, since it uses as much as digits as its factorization.

1157815491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55134081.

The product of its digits is 50400, while the sum is 42.

The square root of 1157815491 is about 34026.6879228643. The cubic root of 1157815491 is about 1050.0575904920.

The spelling of 1157815491 in words is "one billion, one hundred fifty-seven million, eight hundred fifteen thousand, four hundred ninety-one".