54969581 has 2 divisors, whose sum is σ = 54969582. Its totient is φ = 54969580.

The previous prime is 54969569. The next prime is 54969583. The reversal of 54969581 is 18596945.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42367081 + 12602500 = 6509^2 + 3550^2 .

It is a cyclic number.

It is not a de Polignac number, because 54969581 - 2¹⁸ = 54707437 is a prime.

It is a super-2 number, since 2×54969581² = 6043309670631122, which contains 22 as substring.

Together with 54969583, 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 (54969583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27484790 + 27484791.

It is an arithmetic number, because the mean of its divisors is an integer number (27484791).

Almost surely, 2^54969581 is an apocalyptic number.

It is an amenable number.

54969581 is a deficient number, since it is larger than the sum of its proper divisors (1).

54969581 is an equidigital number, since it uses as much as digits as its factorization.

54969581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 47.

The square root of 54969581 is about 7414.1473548885. The cubic root of 54969581 is about 380.2251228372.

The spelling of 54969581 in words is "fifty-four million, nine hundred sixty-nine thousand, five hundred eighty-one".