55001001 has 16 divisors (see below), whose sum is σ = 84708288. Its totient is φ = 31372800.

The previous prime is 55000997. The next prime is 55001003. The reversal of 55001001 is 10010055.

It is not a de Polignac number, because 55001001 - 2² = 55000997 is a prime.

It is a super-2 number, since 2×55001001² = 6050220222004002, which contains 22 as substring.

55001001 is a modest number, since divided by 1001 gives 55 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55001003) 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, 48460 + ... + 49581.

It is an arithmetic number, because the mean of its divisors is an integer number (5294268).

Almost surely, 2^55001001 is an apocalyptic number.

55001001 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55001001 is a deficient number, since it is larger than the sum of its proper divisors (29707287).

55001001 is a wasteful number, since it uses less digits than its factorization.

55001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98072.

The product of its (nonzero) digits is 25, while the sum is 12.

The square root of 55001001 is about 7416.2659741948. The cubic root of 55001001 is about 380.2975531866.

Adding to 55001001 its reverse (10010055), we get a palindrome (65011056).

The spelling of 55001001 in words is "fifty-five million, one thousand, one".