1019091157 has 4 divisors (see below), whose sum is σ = 1164675616. Its totient is φ = 873506700.

The previous prime is 1019091137. The next prime is 1019091173. The reversal of 1019091157 is 7511909101.

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 1019091157 - 2¹⁵ = 1019058389 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 (1019091137) 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 3 ways as a sum of consecutive naturals, for example, 72792219 + ... + 72792232.

It is an arithmetic number, because the mean of its divisors is an integer number (291168904).

Almost surely, 2^1019091157 is an apocalyptic number.

It is an amenable number.

1019091157 is a deficient number, since it is larger than the sum of its proper divisors (145584459).

1019091157 is an equidigital number, since it uses as much as digits as its factorization.

1019091157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145584458.

The product of its (nonzero) digits is 2835, while the sum is 34.

The square root of 1019091157 is about 31923.2071853691. The cubic root of 1019091157 is about 1006.3236462076.

The spelling of 1019091157 in words is "one billion, nineteen million, ninety-one thousand, one hundred fifty-seven".