1949090557 has 4 divisors (see below), whose sum is σ = 1966339260. Its totient is φ = 1931841856.

The previous prime is 1949090537. The next prime is 1949090569. The reversal of 1949090557 is 7550909491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 511619161 + 1437471396 = 22619^2 + 37914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1949090557 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1949090557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949090537) 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, 8624182 + ... + 8624407.

It is an arithmetic number, because the mean of its divisors is an integer number (491584815).

Almost surely, 2^1949090557 is an apocalyptic number.

It is an amenable number.

1949090557 is a deficient number, since it is larger than the sum of its proper divisors (17248703).

1949090557 is a wasteful number, since it uses less digits than its factorization.

1949090557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17248702.

The product of its (nonzero) digits is 510300, while the sum is 49.

The square root of 1949090557 is about 44148.5057165019. The cubic root of 1949090557 is about 1249.1387255280.

The spelling of 1949090557 in words is "one billion, nine hundred forty-nine million, ninety thousand, five hundred fifty-seven".