5091399178 has 4 divisors (see below), whose sum is σ = 7637098770. Its totient is φ = 2545699588.

The previous prime is 5091399161. The next prime is 5091399217. The reversal of 5091399178 is 8719931905.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8719931905 = 5 ⋅1743986381.

It can be written as a sum of positive squares in only one way, i.e., 3446042209 + 1645356969 = 58703^2 + 40563^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272849793 + ... + 1272849796.

Almost surely, 2^5091399178 is an apocalyptic number.

5091399178 is a deficient number, since it is larger than the sum of its proper divisors (2545699592).

5091399178 is a wasteful number, since it uses less digits than its factorization.

5091399178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545699591.

The product of its (nonzero) digits is 612360, while the sum is 52.

The square root of 5091399178 is about 71354.0410768724. The cubic root of 5091399178 is about 1720.3324553414.

The spelling of 5091399178 in words is "five billion, ninety-one million, three hundred ninety-nine thousand, one hundred seventy-eight".