651222157 has 2 divisors, whose sum is σ = 651222158. Its totient is φ = 651222156.

The previous prime is 651222149. The next prime is 651222193. The reversal of 651222157 is 751222156.

651222157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 647906116 + 3316041 = 25454^2 + 1821^2 .

It is a cyclic number.

It is not a de Polignac number, because 651222157 - 2³ = 651222149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651222107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325611078 + 325611079.

It is an arithmetic number, because the mean of its divisors is an integer number (325611079).

Almost surely, 2^651222157 is an apocalyptic number.

It is an amenable number.

651222157 is a deficient number, since it is larger than the sum of its proper divisors (1).

651222157 is an equidigital number, since it uses as much as digits as its factorization.

651222157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 651222157 is about 25519.0547826521. The cubic root of 651222157 is about 866.7816783428.

Subtracting 651222157 from its reverse (751222156), we obtain a palindrome (99999999).

The spelling of 651222157 in words is "six hundred fifty-one million, two hundred twenty-two thousand, one hundred fifty-seven".