54611981 has 2 divisors, whose sum is σ = 54611982. Its totient is φ = 54611980.

The previous prime is 54611941. The next prime is 54611983. The reversal of 54611981 is 18911645.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54257956 + 354025 = 7366^2 + 595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54611981 is a prime.

It is a super-2 number, since 2×54611981² = 5964936937488722, which contains 22 as substring.

Together with 54611983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54611983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27305990 + 27305991.

It is an arithmetic number, because the mean of its divisors is an integer number (27305991).

Almost surely, 2^54611981 is an apocalyptic number.

It is an amenable number.

54611981 is a deficient number, since it is larger than the sum of its proper divisors (1).

54611981 is an equidigital number, since it uses as much as digits as its factorization.

54611981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 35.

The square root of 54611981 is about 7389.9919485748. The cubic root of 54611981 is about 379.3988208741.

The spelling of 54611981 in words is "fifty-four million, six hundred eleven thousand, nine hundred eighty-one".