125780749 has 2 divisors, whose sum is σ = 125780750. Its totient is φ = 125780748.

The previous prime is 125780651. The next prime is 125780777. The reversal of 125780749 is 947087521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101868649 + 23912100 = 10093^2 + 4890^2 .

It is an emirp because it is prime and its reverse (947087521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125780749 - 2⁷ = 125780621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125780549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62890374 + 62890375.

It is an arithmetic number, because the mean of its divisors is an integer number (62890375).

Almost surely, 2^125780749 is an apocalyptic number.

It is an amenable number.

125780749 is a deficient number, since it is larger than the sum of its proper divisors (1).

125780749 is an equidigital number, since it uses as much as digits as its factorization.

125780749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 125780749 is about 11215.2016923460. The cubic root of 125780749 is about 501.0388387998.

The spelling of 125780749 in words is "one hundred twenty-five million, seven hundred eighty thousand, seven hundred forty-nine".