125355551 has 4 divisors (see below), whose sum is σ = 126154152. Its totient is φ = 124556952.

The previous prime is 125355539. The next prime is 125355553. The reversal of 125355551 is 155553521.

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 125355551 - 2²⁶ = 58246687 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 (125355553) 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, 399065 + ... + 399378.

It is an arithmetic number, because the mean of its divisors is an integer number (31538538).

Almost surely, 2^125355551 is an apocalyptic number.

125355551 is a deficient number, since it is larger than the sum of its proper divisors (798601).

125355551 is an equidigital number, since it uses as much as digits as its factorization.

125355551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798600.

The product of its digits is 18750, while the sum is 32.

The square root of 125355551 is about 11196.2293206240. The cubic root of 125355551 is about 500.4736192280.

The spelling of 125355551 in words is "one hundred twenty-five million, three hundred fifty-five thousand, five hundred fifty-one".