651415993 has 2 divisors, whose sum is σ = 651415994. Its totient is φ = 651415992.

The previous prime is 651415943. The next prime is 651415997. The reversal of 651415993 is 399514156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 635191209 + 16224784 = 25203^2 + 4028^2 .

It is a cyclic number.

It is not a de Polignac number, because 651415993 - 2²¹ = 649318841 is a prime.

It is not a weakly prime, because it can be changed into another prime (651415997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325707996 + 325707997.

It is an arithmetic number, because the mean of its divisors is an integer number (325707997).

Almost surely, 2^651415993 is an apocalyptic number.

It is an amenable number.

651415993 is a deficient number, since it is larger than the sum of its proper divisors (1).

651415993 is an equidigital number, since it uses as much as digits as its factorization.

651415993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 43.

The square root of 651415993 is about 25522.8523680250. The cubic root of 651415993 is about 866.8676688785.

The spelling of 651415993 in words is "six hundred fifty-one million, four hundred fifteen thousand, nine hundred ninety-three".