55001091 has 4 divisors (see below), whose sum is σ = 73334792. Its totient is φ = 36667392.

The previous prime is 55001083. The next prime is 55001101. The reversal of 55001091 is 19010055.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55001091 - 2³ = 55001083 is a prime.

It is a super-2 number, since 2×55001091² = 6050240022380562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55001041) 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, 9166846 + ... + 9166851.

It is an arithmetic number, because the mean of its divisors is an integer number (18333698).

Almost surely, 2^55001091 is an apocalyptic number.

55001091 is a deficient number, since it is larger than the sum of its proper divisors (18333701).

55001091 is a wasteful number, since it uses less digits than its factorization.

55001091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18333700.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 55001091 is about 7416.2720419359. The cubic root of 55001091 is about 380.2977606178.

The spelling of 55001091 in words is "fifty-five million, one thousand, ninety-one".