54613781 has 2 divisors, whose sum is σ = 54613782. Its totient is φ = 54613780.

The previous prime is 54613747. The next prime is 54613787. The reversal of 54613781 is 18731645.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54612100 + 1681 = 7390^2 + 41^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54613781 is a prime.

It is a super-2 number, since 2×54613781² = 5965330150231922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54613787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27306890 + 27306891.

It is an arithmetic number, because the mean of its divisors is an integer number (27306891).

Almost surely, 2^54613781 is an apocalyptic number.

It is an amenable number.

54613781 is a deficient number, since it is larger than the sum of its proper divisors (1).

54613781 is an equidigital number, since it uses as much as digits as its factorization.

54613781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 54613781 is about 7390.1137339015. The cubic root of 54613781 is about 379.4029891314.

The spelling of 54613781 in words is "fifty-four million, six hundred thirteen thousand, seven hundred eighty-one".