54981491 has 2 divisors, whose sum is σ = 54981492. Its totient is φ = 54981490.

The previous prime is 54981481. The next prime is 54981517. The reversal of 54981491 is 19418945.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54981491 is a prime.

It is not a weakly prime, because it can be changed into another prime (54981401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27490745 + 27490746.

It is an arithmetic number, because the mean of its divisors is an integer number (27490746).

Almost surely, 2^54981491 is an apocalyptic number.

54981491 is a deficient number, since it is larger than the sum of its proper divisors (1).

54981491 is an equidigital number, since it uses as much as digits as its factorization.

54981491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 54981491 is about 7414.9505055664. The cubic root of 54981491 is about 380.2525813825.

The spelling of 54981491 in words is "fifty-four million, nine hundred eighty-one thousand, four hundred ninety-one".