125515001 has 4 divisors (see below), whose sum is σ = 129563904. Its totient is φ = 121466100.

The previous prime is 125514943. The next prime is 125515021. The reversal of 125515001 is 100515521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125515001 - 2¹⁸ = 125252857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125515021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2024405 + ... + 2024466.

It is an arithmetic number, because the mean of its divisors is an integer number (32390976).

Almost surely, 2^125515001 is an apocalyptic number.

It is an amenable number.

125515001 is a deficient number, since it is larger than the sum of its proper divisors (4048903).

125515001 is an equidigital number, since it uses as much as digits as its factorization.

125515001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048902.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 125515001 is about 11203.3477585943. The cubic root of 125515001 is about 500.6857271267.

The spelling of 125515001 in words is "one hundred twenty-five million, five hundred fifteen thousand, one".