549929921 has 2 divisors, whose sum is σ = 549929922. Its totient is φ = 549929920.

The previous prime is 549929917. The next prime is 549929969. The reversal of 549929921 is 129929945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 536570896 + 13359025 = 23164^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 549929921 - 2² = 549929917 is a prime.

It is a super-2 number, since 2×549929921² = 604845836022132482, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 549929921.

It is not a weakly prime, because it can be changed into another prime (549929971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274964960 + 274964961.

It is an arithmetic number, because the mean of its divisors is an integer number (274964961).

Almost surely, 2^549929921 is an apocalyptic number.

It is an amenable number.

549929921 is a deficient number, since it is larger than the sum of its proper divisors (1).

549929921 is an equidigital number, since it uses as much as digits as its factorization.

549929921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 549929921 is about 23450.5846622211. The cubic root of 549929921 is about 819.2864708103.

The spelling of 549929921 in words is "five hundred forty-nine million, nine hundred twenty-nine thousand, nine hundred twenty-one".