54825781 has 4 divisors (see below), whose sum is σ = 54858412. Its totient is φ = 54793152.

The previous prime is 54825713. The next prime is 54825787. The reversal of 54825781 is 18752845.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15563025 + 39262756 = 3945^2 + 6266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54825781 is a prime.

It is a super-2 number, since 2×54825781² = 6011732524519922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54825787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13650 + ... + 17203.

It is an arithmetic number, because the mean of its divisors is an integer number (13714603).

Almost surely, 2^54825781 is an apocalyptic number.

It is an amenable number.

54825781 is a deficient number, since it is larger than the sum of its proper divisors (32631).

54825781 is a wasteful number, since it uses less digits than its factorization.

54825781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32630.

The product of its digits is 89600, while the sum is 40.

The square root of 54825781 is about 7404.4433281645. The cubic root of 54825781 is about 379.8932779711.

The spelling of 54825781 in words is "fifty-four million, eight hundred twenty-five thousand, seven hundred eighty-one".