54147781 has 4 divisors (see below), whose sum is σ = 55065600. Its totient is φ = 53229964.

The previous prime is 54147767. The next prime is 54147787. The reversal of 54147781 is 18774145.

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 54147781 - 2⁵ = 54147749 is a prime.

It is a super-2 number, since 2×54147781² = 5863964374447922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 54147781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54147787) 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, 458821 + ... + 458938.

It is an arithmetic number, because the mean of its divisors is an integer number (13766400).

Almost surely, 2^54147781 is an apocalyptic number.

It is an amenable number.

54147781 is a deficient number, since it is larger than the sum of its proper divisors (917819).

54147781 is an equidigital number, since it uses as much as digits as its factorization.

54147781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917818.

The product of its digits is 31360, while the sum is 37.

The square root of 54147781 is about 7358.5175816872. The cubic root of 54147781 is about 378.3208016360.

The spelling of 54147781 in words is "fifty-four million, one hundred forty-seven thousand, seven hundred eighty-one".