125495187491 has 2 divisors, whose sum is σ = 125495187492. Its totient is φ = 125495187490.

The previous prime is 125495187481. The next prime is 125495187497. The reversal of 125495187491 is 194781594521.

It is a strong prime.

It is an emirp because it is prime and its reverse (194781594521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125495187491 is a prime.

It is not a weakly prime, because it can be changed into another prime (125495187497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62747593745 + 62747593746.

It is an arithmetic number, because the mean of its divisors is an integer number (62747593746).

Almost surely, 2^125495187491 is an apocalyptic number.

125495187491 is a deficient number, since it is larger than the sum of its proper divisors (1).

125495187491 is an equidigital number, since it uses as much as digits as its factorization.

125495187491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3628800, while the sum is 56.

The spelling of 125495187491 in words is "one hundred twenty-five billion, four hundred ninety-five million, one hundred eighty-seven thousand, four hundred ninety-one".