549817157 has 4 divisors (see below), whose sum is σ = 551020716. Its totient is φ = 548613600.

The previous prime is 549817153. The next prime is 549817183. The reversal of 549817157 is 751718945.

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 314317441 + 235499716 = 17729^2 + 15346^2 .

It is a cyclic number.

It is not a de Polignac number, because 549817157 - 2² = 549817153 is a prime.

It is a super-2 number, since 2×549817157² = 604597812263125298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549817153) 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, 601094 + ... + 602007.

It is an arithmetic number, because the mean of its divisors is an integer number (137755179).

Almost surely, 2^549817157 is an apocalyptic number.

It is an amenable number.

549817157 is a deficient number, since it is larger than the sum of its proper divisors (1203559).

549817157 is a wasteful number, since it uses less digits than its factorization.

549817157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203558.

The product of its digits is 352800, while the sum is 47.

The square root of 549817157 is about 23448.1802492219. The cubic root of 549817157 is about 819.2304683201.

The spelling of 549817157 in words is "five hundred forty-nine million, eight hundred seventeen thousand, one hundred fifty-seven".