125000687549 has 2 divisors, whose sum is σ = 125000687550. Its totient is φ = 125000687548.

The previous prime is 125000687467. The next prime is 125000687611. The reversal of 125000687549 is 945786000521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79097625049 + 45903062500 = 281243^2 + 214250^2 .

It is a cyclic number.

It is not a de Polignac number, because 125000687549 - 2¹² = 125000683453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125005687549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62500343774 + 62500343775.

It is an arithmetic number, because the mean of its divisors is an integer number (62500343775).

Almost surely, 2^125000687549 is an apocalyptic number.

It is an amenable number.

125000687549 is a deficient number, since it is larger than the sum of its proper divisors (1).

125000687549 is an equidigital number, since it uses as much as digits as its factorization.

125000687549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 125000687549 in words is "one hundred twenty-five billion, six hundred eighty-seven thousand, five hundred forty-nine".