125816651 has 4 divisors (see below), whose sum is σ = 132438600. Its totient is φ = 119194704.

The previous prime is 125816641. The next prime is 125816657. The reversal of 125816651 is 156618521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156618521 = 37 ⋅4232933.

It is a cyclic number.

It is not a de Polignac number, because 125816651 - 2¹⁴ = 125800267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125816657) 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, 3310946 + ... + 3310983.

It is an arithmetic number, because the mean of its divisors is an integer number (33109650).

Almost surely, 2^125816651 is an apocalyptic number.

125816651 is a deficient number, since it is larger than the sum of its proper divisors (6621949).

125816651 is an equidigital number, since it uses as much as digits as its factorization.

125816651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6621948.

The product of its digits is 14400, while the sum is 35.

The square root of 125816651 is about 11216.8021735252. The cubic root of 125816651 is about 501.0865053023.

The spelling of 125816651 in words is "one hundred twenty-five million, eight hundred sixteen thousand, six hundred fifty-one".