125000000001 has 12 divisors (see below), whose sum is σ = 180663888912. Its totient is φ = 83283333336.

The previous prime is 124999999997. The next prime is 125000000003. The reversal of 125000000001 is 100000000521.

It is a happy number.

It is a Cunningham number, because it is equal to 5000³+1.

It is not a de Polignac number, because 125000000001 - 2² = 124999999997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a self number, because there is not a number n which added to its sum of digits gives 125000000001.

It is not an unprimeable number, because it can be changed into a prime (125000000003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4150831 + ... + 4180836.

It is an arithmetic number, because the mean of its divisors is an integer number (15055324076).

Almost surely, 2^125000000001 is an apocalyptic number.

It is an amenable number.

125000000001 is a deficient number, since it is larger than the sum of its proper divisors (55663888911).

125000000001 is a wasteful number, since it uses less digits than its factorization.

125000000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8333340 (or 8333337 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

Adding to 125000000001 its reverse (100000000521), we get a palindrome (225000000522).

The spelling of 125000000001 in words is "one hundred twenty-five billion, one", and thus it is an aban number.