49157813 has 8 divisors (see below), whose sum is σ = 50977080. Its totient is φ = 47346880.

The previous prime is 49157809. The next prime is 49157837. The reversal of 49157813 is 31875194.

It can be written as a sum of positive squares in 4 ways, for example, as 10195249 + 38962564 = 3193^2 + 6242^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 49157813 - 2² = 49157809 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 (49157113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11531 + ... + 15207.

It is an arithmetic number, because the mean of its divisors is an integer number (6372135).

Almost surely, 2^49157813 is an apocalyptic number.

It is an amenable number.

49157813 is a deficient number, since it is larger than the sum of its proper divisors (1819267).

49157813 is a wasteful number, since it uses less digits than its factorization.

49157813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167.

The product of its digits is 30240, while the sum is 38.

The square root of 49157813 is about 7011.2632955838. The cubic root of 49157813 is about 366.3229976379.

The spelling of 49157813 in words is "forty-nine million, one hundred fifty-seven thousand, eight hundred thirteen".