549531971 has 2 divisors, whose sum is σ = 549531972. Its totient is φ = 549531970.

The previous prime is 549531949. The next prime is 549531973. The reversal of 549531971 is 179135945.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-549531971 is a prime.

It is a super-2 number, since 2×549531971² = 603970774302289682, which contains 22 as substring.

Together with 549531973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (549531973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274765985 + 274765986.

It is an arithmetic number, because the mean of its divisors is an integer number (274765986).

Almost surely, 2^549531971 is an apocalyptic number.

549531971 is a deficient number, since it is larger than the sum of its proper divisors (1).

549531971 is an equidigital number, since it uses as much as digits as its factorization.

549531971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 44.

The square root of 549531971 is about 23442.0982635941. The cubic root of 549531971 is about 819.0888009412.

The spelling of 549531971 in words is "five hundred forty-nine million, five hundred thirty-one thousand, nine hundred seventy-one".