15625001 has 8 divisors (see below), whose sum is σ = 17930304. Its totient is φ = 13338000.

The previous prime is 15624979. The next prime is 15625007. The reversal of 15625001 is 10052651.

It is a Cunningham number, because it is equal to 250³+1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15625001 - 2¹⁴ = 15608617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15625007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2690 + ... + 6203.

It is an arithmetic number, because the mean of its divisors is an integer number (2241288).

Almost surely, 2^15625001 is an apocalyptic number.

It is an amenable number.

15625001 is a deficient number, since it is larger than the sum of its proper divisors (2305303).

15625001 is an equidigital number, since it uses as much as digits as its factorization.

15625001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9151.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 15625001 is about 3952.8472017016. The cubic root of 15625001 is about 250.0000053333. Note that the first 5 decimals are identical.

Adding to 15625001 its reverse (10052651), we get a palindrome (25677652).

The spelling of 15625001 in words is "fifteen million, six hundred twenty-five thousand, one".