54259981 has 2 divisors, whose sum is σ = 54259982. Its totient is φ = 54259980.

The previous prime is 54259963. The next prime is 54259987. The reversal of 54259981 is 18995245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54257956 + 2025 = 7366^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 54259981 - 2¹⁵ = 54227213 is a prime.

It is a super-2 number, since 2×54259981² = 5888291076240722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54259987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27129990 + 27129991.

It is an arithmetic number, because the mean of its divisors is an integer number (27129991).

Almost surely, 2^54259981 is an apocalyptic number.

It is an amenable number.

54259981 is a deficient number, since it is larger than the sum of its proper divisors (1).

54259981 is an equidigital number, since it uses as much as digits as its factorization.

54259981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 43.

The square root of 54259981 is about 7366.1374545959. The cubic root of 54259981 is about 378.5819284277.

The spelling of 54259981 in words is "fifty-four million, two hundred fifty-nine thousand, nine hundred eighty-one".