55101561 has 8 divisors (see below), whose sum is σ = 73955904. Its totient is φ = 36490800.

The previous prime is 55101559. The next prime is 55101569. The reversal of 55101561 is 16510155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55101561 - 2¹ = 55101559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55101569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60366 + ... + 61271.

It is an arithmetic number, because the mean of its divisors is an integer number (9244488).

Almost surely, 2^55101561 is an apocalyptic number.

It is an amenable number.

55101561 is a deficient number, since it is larger than the sum of its proper divisors (18854343).

55101561 is a wasteful number, since it uses less digits than its factorization.

55101561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121791.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 55101561 is about 7423.0425702673. The cubic root of 55101561 is about 380.5291819335.

It can be divided in two parts, 55 and 101561, that multiplied together give a palindrome (5585855).

The spelling of 55101561 in words is "fifty-five million, one hundred one thousand, five hundred sixty-one".