651266251 has 4 divisors (see below), whose sum is σ = 652070104. Its totient is φ = 650462400.

The previous prime is 651266237. The next prime is 651266257. The reversal of 651266251 is 152662156.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 651266251 - 2²³ = 642877643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651266257) 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, 400710 + ... + 402331.

It is an arithmetic number, because the mean of its divisors is an integer number (163017526).

Almost surely, 2^651266251 is an apocalyptic number.

651266251 is a deficient number, since it is larger than the sum of its proper divisors (803853).

651266251 is an equidigital number, since it uses as much as digits as its factorization.

651266251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803852.

The product of its digits is 21600, while the sum is 34.

The square root of 651266251 is about 25519.9187106856. The cubic root of 651266251 is about 866.8012410518.

The spelling of 651266251 in words is "six hundred fifty-one million, two hundred sixty-six thousand, two hundred fifty-one".