55591001 has 4 divisors (see below), whose sum is σ = 55840512. Its totient is φ = 55341492.

The previous prime is 55590961. The next prime is 55591007. The reversal of 55591001 is 10019555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55591001 - 2¹⁸ = 55328857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55591007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124421 + ... + 124866.

It is an arithmetic number, because the mean of its divisors is an integer number (13960128).

Almost surely, 2^55591001 is an apocalyptic number.

It is an amenable number.

55591001 is a deficient number, since it is larger than the sum of its proper divisors (249511).

55591001 is a wasteful number, since it uses less digits than its factorization.

55591001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249510.

The product of its (nonzero) digits is 1125, while the sum is 26.

The square root of 55591001 is about 7455.9372985561. The cubic root of 55591001 is about 381.6525467424.

The spelling of 55591001 in words is "fifty-five million, five hundred ninety-one thousand, one".