54087781 has 4 divisors (see below), whose sum is σ = 59004864. Its totient is φ = 49170700.

The previous prime is 54087779. The next prime is 54087797. The reversal of 54087781 is 18778045.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 54087781 - 2¹ = 54087779 is a prime.

It is a super-2 number, since 2×54087781² = 5850976107007922, 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 (54087701) 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, 2458525 + ... + 2458546.

It is an arithmetic number, because the mean of its divisors is an integer number (14751216).

Almost surely, 2^54087781 is an apocalyptic number.

It is an amenable number.

54087781 is a deficient number, since it is larger than the sum of its proper divisors (4917083).

54087781 is a wasteful number, since it uses less digits than its factorization.

54087781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4917082.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 54087781 is about 7354.4395435682. The cubic root of 54087781 is about 378.1810135903.

The spelling of 54087781 in words is "fifty-four million, eighty-seven thousand, seven hundred eighty-one".