55553551 has 4 divisors (see below), whose sum is σ = 55668112. Its totient is φ = 55438992.

The previous prime is 55553521. The next prime is 55553567. The reversal of 55553551 is 15535555.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55553551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55553521) 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, 56550 + ... + 57523.

It is an arithmetic number, because the mean of its divisors is an integer number (13917028).

Almost surely, 2^55553551 is an apocalyptic number.

55553551 is a deficient number, since it is larger than the sum of its proper divisors (114561).

55553551 is a wasteful number, since it uses less digits than its factorization.

55553551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114560.

The product of its digits is 46875, while the sum is 34.

The square root of 55553551 is about 7453.4254541117. The cubic root of 55553551 is about 381.5668248427.

The spelling of 55553551 in words is "fifty-five million, five hundred fifty-three thousand, five hundred fifty-one".