125415779 has 2 divisors, whose sum is σ = 125415780. Its totient is φ = 125415778.

The previous prime is 125415733. The next prime is 125415781. The reversal of 125415779 is 977514521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125415779 is a prime.

Together with 125415781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125415379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62707889 + 62707890.

It is an arithmetic number, because the mean of its divisors is an integer number (62707890).

Almost surely, 2^125415779 is an apocalyptic number.

125415779 is a deficient number, since it is larger than the sum of its proper divisors (1).

125415779 is an equidigital number, since it uses as much as digits as its factorization.

125415779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 41.

The square root of 125415779 is about 11198.9186531558. The cubic root of 125415779 is about 500.5537584767.

The spelling of 125415779 in words is "one hundred twenty-five million, four hundred fifteen thousand, seven hundred seventy-nine".