1091513797 has 4 divisors (see below), whose sum is σ = 1190742336. Its totient is φ = 992285260.

The previous prime is 1091513789. The next prime is 1091513851. The reversal of 1091513797 is 7973151901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1091513797 - 2³ = 1091513789 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 (1091513777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49614253 + ... + 49614274.

It is an arithmetic number, because the mean of its divisors is an integer number (297685584).

Almost surely, 2^1091513797 is an apocalyptic number.

It is an amenable number.

1091513797 is a deficient number, since it is larger than the sum of its proper divisors (99228539).

1091513797 is an equidigital number, since it uses as much as digits as its factorization.

1091513797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99228538.

The product of its (nonzero) digits is 59535, while the sum is 43.

The square root of 1091513797 is about 33038.0658786195. The cubic root of 1091513797 is about 1029.6186721135.

The spelling of 1091513797 in words is "one billion, ninety-one million, five hundred thirteen thousand, seven hundred ninety-seven".