78125001 has 16 divisors (see below), whose sum is σ = 105883200. Its totient is φ = 51231488.

The previous prime is 78124999. The next prime is 78125041. The reversal of 78125001 is 10052187.

It is a cyclic number.

It is not a de Polignac number, because 78125001 - 2¹ = 78124999 is a prime.

It is a super-2 number, since 2×78125001² = 12207031562500002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78125041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59965 + ... + 61253.

It is an arithmetic number, because the mean of its divisors is an integer number (6617700).

Almost surely, 2^78125001 is an apocalyptic number.

It is an amenable number.

78125001 is a deficient number, since it is larger than the sum of its proper divisors (27758199).

78125001 is a wasteful number, since it uses less digits than its factorization.

78125001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 78125001 is about 8838.8348214004. The cubic root of 78125001 is about 427.4939884931.

Adding to 78125001 its reverse (10052187), we get a palindrome (88177188).

The spelling of 78125001 in words is "seventy-eight million, one hundred twenty-five thousand, one".