54581557 has 2 divisors, whose sum is σ = 54581558. Its totient is φ = 54581556.

The previous prime is 54581503. The next prime is 54581581. The reversal of 54581557 is 75518545.

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., 54552996 + 28561 = 7386^2 + 169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54581557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54581057) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27290778 + 27290779.

It is an arithmetic number, because the mean of its divisors is an integer number (27290779).

Almost surely, 2^54581557 is an apocalyptic number.

It is an amenable number.

54581557 is a deficient number, since it is larger than the sum of its proper divisors (1).

54581557 is an equidigital number, since it uses as much as digits as its factorization.

54581557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 140000, while the sum is 40.

The square root of 54581557 is about 7387.9332021886. The cubic root of 54581557 is about 379.3283542008.

The spelling of 54581557 in words is "fifty-four million, five hundred eighty-one thousand, five hundred fifty-seven".