525555551 has 4 divisors (see below), whose sum is σ = 536737632. Its totient is φ = 514373472.

The previous prime is 525555517. The next prime is 525555557. The reversal of 525555551 is 155555525.

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

It is a cyclic number.

It is not a de Polignac number, because 525555551 - 2¹⁸ = 525293407 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 (525555557) 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, 5590970 + ... + 5591063.

It is an arithmetic number, because the mean of its divisors is an integer number (134184408).

Almost surely, 2^525555551 is an apocalyptic number.

525555551 is a deficient number, since it is larger than the sum of its proper divisors (11182081).

525555551 is a wasteful number, since it uses less digits than its factorization.

525555551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11182080.

The product of its digits is 156250, while the sum is 38.

The square root of 525555551 is about 22924.9983860414. The cubic root of 525555551 is about 806.9987756840.

It can be divided in two parts, 5255 and 55551, that added together give a palindrome (60806).

The spelling of 525555551 in words is "five hundred twenty-five million, five hundred fifty-five thousand, five hundred fifty-one".