125130991 has 2 divisors, whose sum is σ = 125130992. Its totient is φ = 125130990.

The previous prime is 125130983. The next prime is 125131037. The reversal of 125130991 is 199031521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125130991 - 2³ = 125130983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125130961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62565495 + 62565496.

It is an arithmetic number, because the mean of its divisors is an integer number (62565496).

Almost surely, 2^125130991 is an apocalyptic number.

125130991 is a deficient number, since it is larger than the sum of its proper divisors (1).

125130991 is an equidigital number, since it uses as much as digits as its factorization.

125130991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 125130991 is about 11186.1964491958. The cubic root of 125130991 is about 500.1745936937.

The spelling of 125130991 in words is "one hundred twenty-five million, one hundred thirty thousand, nine hundred ninety-one".