125709949281 has 24 divisors (see below), whose sum is σ = 195148065504. Its totient is φ = 71771857920.

The previous prime is 125709949259. The next prime is 125709949307. The reversal of 125709949281 is 182949907521.

It is not a de Polignac number, because 125709949281 - 2⁶ = 125709949217 is a prime.

It is a super-2 number, since 2×125709949281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125709929281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201355 + ... + 540336.

It is an arithmetic number, because the mean of its divisors is an integer number (8131169396).

Almost surely, 2^125709949281 is an apocalyptic number.

It is an amenable number.

125709949281 is a deficient number, since it is larger than the sum of its proper divisors (69438116223).

125709949281 is a wasteful number, since it uses less digits than its factorization.

125709949281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742861 (or 742854 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 57.

The spelling of 125709949281 in words is "one hundred twenty-five billion, seven hundred nine million, nine hundred forty-nine thousand, two hundred eighty-one".