54951561 has 64 divisors (see below), whose sum is σ = 98058240. Its totient is φ = 29756160.

The previous prime is 54951551. The next prime is 54951563. The reversal of 54951561 is 16515945.

54951561 is a `hidden beast` number, since 5 + 4 + 95 + 1 + 561 = 666.

It is not a de Polignac number, because 54951561 - 2⁵ = 54951529 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (54951563) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 486241 + ... + 486353.

It is an arithmetic number, because the mean of its divisors is an integer number (1532160).

Almost surely, 2^54951561 is an apocalyptic number.

It is an amenable number.

54951561 is a deficient number, since it is larger than the sum of its proper divisors (43106679).

54951561 is a wasteful number, since it uses less digits than its factorization.

54951561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 237 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 54951561 is about 7412.9320110197. The cubic root of 54951561 is about 380.1835701249.

It can be divided in two parts, 5495 and 1561, that added together give a square (7056 = 84²).

The spelling of 54951561 in words is "fifty-four million, nine hundred fifty-one thousand, five hundred sixty-one".