54717561 has 18 divisors (see below), whose sum is σ = 81248622. Its totient is φ = 35484480.

The previous prime is 54717557. The next prime is 54717563. The reversal of 54717561 is 16571745.

It can be written as a sum of positive squares in 3 ways, for example, as 27625536 + 27092025 = 5256^2 + 5205^2 .

It is not a de Polignac number, because 54717561 - 2² = 54717557 is a prime.

It is a super-2 number, since 2×54717561² = 5988022963577442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54717563) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10101 + ... + 14541.

Almost surely, 2^54717561 is an apocalyptic number.

It is an amenable number.

54717561 is a deficient number, since it is larger than the sum of its proper divisors (26531061).

54717561 is a wasteful number, since it uses less digits than its factorization.

54717561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521 (or 4481 counting only the distinct ones).

The product of its digits is 29400, while the sum is 36.

The square root of 54717561 is about 7397.1319442065. The cubic root of 54717561 is about 379.6431576220.

It can be divided in two parts, 54717 and 561, that added together give a triangular number (55278 = T₃₃₂).

The spelling of 54717561 in words is "fifty-four million, seven hundred seventeen thousand, five hundred sixty-one".