651372521 has 2 divisors, whose sum is σ = 651372522. Its totient is φ = 651372520.

The previous prime is 651372437. The next prime is 651372539. The reversal of 651372521 is 125273156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374616025 + 276756496 = 19355^2 + 16636^2 .

It is a cyclic number.

It is not a de Polignac number, because 651372521 - 2¹⁸ = 651110377 is a prime.

It is a super-2 number, since 2×651372521² = 848572322227790882, which contains 22 as substring.

It is a Chen prime.

It is equal to p_33861245 and since 651372521 and 33861245 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (651372541) 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, 325686260 + 325686261.

It is an arithmetic number, because the mean of its divisors is an integer number (325686261).

Almost surely, 2^651372521 is an apocalyptic number.

It is an amenable number.

651372521 is a deficient number, since it is larger than the sum of its proper divisors (1).

651372521 is an equidigital number, since it uses as much as digits as its factorization.

651372521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 32.

The square root of 651372521 is about 25522.0007248648. Note that the first 3 decimals coincide. The cubic root of 651372521 is about 866.8483850875.

The spelling of 651372521 in words is "six hundred fifty-one million, three hundred seventy-two thousand, five hundred twenty-one".