55497561 has 16 divisors (see below), whose sum is σ = 87484800. Its totient is φ = 30619008.

The previous prime is 55497539. The next prime is 55497569. The reversal of 55497561 is 16579455.

It is not a de Polignac number, because 55497561 - 2⁵ = 55497529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55497569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44956 + ... + 46173.

It is an arithmetic number, because the mean of its divisors is an integer number (5467800).

Almost surely, 2^55497561 is an apocalyptic number.

It is an amenable number.

55497561 is a deficient number, since it is larger than the sum of its proper divisors (31987239).

55497561 is a wasteful number, since it uses less digits than its factorization.

55497561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91168.

The product of its digits is 189000, while the sum is 42.

The square root of 55497561 is about 7449.6685161153. The cubic root of 55497561 is about 381.4385935690.

The spelling of 55497561 in words is "fifty-five million, four hundred ninety-seven thousand, five hundred sixty-one".