125204551 has 4 divisors (see below), whose sum is σ = 126045000. Its totient is φ = 124364104.

The previous prime is 125204543. The next prime is 125204621. The reversal of 125204551 is 155402521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155402521 = 3457 ⋅44953.

It is a cyclic number.

It is not a de Polignac number, because 125204551 - 2³ = 125204543 is a prime.

It is a super-2 number, since 2×125204551² = 31352359182223202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125204351) 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, 420001 + ... + 420298.

It is an arithmetic number, because the mean of its divisors is an integer number (31511250).

Almost surely, 2^125204551 is an apocalyptic number.

125204551 is a deficient number, since it is larger than the sum of its proper divisors (840449).

125204551 is an equidigital number, since it uses as much as digits as its factorization.

125204551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840448.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 125204551 is about 11189.4839469924. The cubic root of 125204551 is about 500.2725860334.

It can be divided in two parts, 12520 and 4551, that added together give a palindrome (17071).

The spelling of 125204551 in words is "one hundred twenty-five million, two hundred four thousand, five hundred fifty-one".