1250000001 has 12 divisors (see below), whose sum is σ = 1822431312. Its totient is φ = 825544536.

The previous prime is 1249999997. The next prime is 1250000027. The reversal of 1250000001 is 1000000521.

It is a happy number.

It is not a de Polignac number, because 1250000001 - 2² = 1249999997 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1250000041) 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, 648051 + ... + 649976.

It is an arithmetic number, because the mean of its divisors is an integer number (151869276).

Almost surely, 2^1250000001 is an apocalyptic number.

It is an amenable number.

1250000001 is a deficient number, since it is larger than the sum of its proper divisors (572431311).

1250000001 is a wasteful number, since it uses less digits than its factorization.

1250000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298140 (or 1298137 counting only the distinct ones).

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

The square root of 1250000001 is about 35355.3390734695. The cubic root of 1250000001 is about 1077.2173453032.

Adding to 1250000001 its reverse (1000000521), we get a palindrome (2250000522).

The spelling of 1250000001 in words is "one billion, two hundred fifty million, one", and thus it is an aban number.