55151551 has 16 divisors (see below), whose sum is σ = 68121088. Its totient is φ = 43480800.

The previous prime is 55151549. The next prime is 55151557. The reversal of 55151551 is 15515155.

It is a cyclic number.

It is not a de Polignac number, because 55151551 - 2¹ = 55151549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55151557) 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, 29206 + ... + 31036.

It is an arithmetic number, because the mean of its divisors is an integer number (4257568).

Almost surely, 2^55151551 is an apocalyptic number.

55151551 is a deficient number, since it is larger than the sum of its proper divisors (12969537).

55151551 is a wasteful number, since it uses less digits than its factorization.

55151551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182.

The product of its digits is 3125, while the sum is 28.

The square root of 55151551 is about 7426.4090245555. The cubic root of 55151551 is about 380.6442234659.

The spelling of 55151551 in words is "fifty-five million, one hundred fifty-one thousand, five hundred fifty-one".