549691957 has 4 divisors (see below), whose sum is σ = 582026796. Its totient is φ = 517357120.

The previous prime is 549691937. The next prime is 549691963. The reversal of 549691957 is 759196945.

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 514337041 + 35354916 = 22679^2 + 5946^2 .

It is a cyclic number.

It is not a de Polignac number, because 549691957 - 2²³ = 541303349 is a prime.

It is a super-3 number, since 3×549691957³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 549691898 and 549691907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549691937) 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, 16167394 + ... + 16167427.

It is an arithmetic number, because the mean of its divisors is an integer number (145506699).

Almost surely, 2^549691957 is an apocalyptic number.

It is an amenable number.

549691957 is a deficient number, since it is larger than the sum of its proper divisors (32334839).

549691957 is a wasteful number, since it uses less digits than its factorization.

549691957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32334838.

The product of its digits is 3061800, while the sum is 55.

The square root of 549691957 is about 23445.5103804545. The cubic root of 549691957 is about 819.1682807125.

The spelling of 549691957 in words is "five hundred forty-nine million, six hundred ninety-one thousand, nine hundred fifty-seven".