125840551 has 2 divisors, whose sum is σ = 125840552. Its totient is φ = 125840550.

The previous prime is 125840543. The next prime is 125840557. The reversal of 125840551 is 155048521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125840551 - 2³ = 125840543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125840557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62920275 + 62920276.

It is an arithmetic number, because the mean of its divisors is an integer number (62920276).

Almost surely, 2^125840551 is an apocalyptic number.

125840551 is a deficient number, since it is larger than the sum of its proper divisors (1).

125840551 is an equidigital number, since it uses as much as digits as its factorization.

125840551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8000, while the sum is 31.

The square root of 125840551 is about 11217.8674889660. The cubic root of 125840551 is about 501.1182319170.

The spelling of 125840551 in words is "one hundred twenty-five million, eight hundred forty thousand, five hundred fifty-one".