125403551 has 8 divisors (see below), whose sum is σ = 154342944. Its totient is φ = 99220320.

The previous prime is 125403547. The next prime is 125403559. The reversal of 125403551 is 155304521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125403551 - 2² = 125403547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125403551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125403559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688940 + ... + 689121.

It is an arithmetic number, because the mean of its divisors is an integer number (19292868).

Almost surely, 2^125403551 is an apocalyptic number.

125403551 is a deficient number, since it is larger than the sum of its proper divisors (28939393).

125403551 is a wasteful number, since it uses less digits than its factorization.

125403551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378081.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 125403551 is about 11198.3726942802. The cubic root of 125403551 is about 500.5374900020.

The spelling of 125403551 in words is "one hundred twenty-five million, four hundred three thousand, five hundred fifty-one".