54955991 has 2 divisors, whose sum is σ = 54955992. Its totient is φ = 54955990.

The previous prime is 54955973. The next prime is 54956003. The reversal of 54955991 is 19955945.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 54955991 - 2¹⁰ = 54954967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54955931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27477995 + 27477996.

It is an arithmetic number, because the mean of its divisors is an integer number (27477996).

Almost surely, 2^54955991 is an apocalyptic number.

54955991 is a deficient number, since it is larger than the sum of its proper divisors (1).

54955991 is an equidigital number, since it uses as much as digits as its factorization.

54955991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 364500, while the sum is 47.

The square root of 54955991 is about 7413.2308071447. The cubic root of 54955991 is about 380.1937862008.

The spelling of 54955991 in words is "fifty-four million, nine hundred fifty-five thousand, nine hundred ninety-one".