651461969 has 2 divisors, whose sum is σ = 651461970. Its totient is φ = 651461968.

The previous prime is 651461939. The next prime is 651461977. The reversal of 651461969 is 969164156.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648364369 + 3097600 = 25463^2 + 1760^2 .

It is a cyclic number.

It is not a de Polignac number, because 651461969 - 2²⁸ = 383026513 is a prime.

It is a super-2 number, since 2×651461969² = 848805394106713922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (651461929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325730984 + 325730985.

It is an arithmetic number, because the mean of its divisors is an integer number (325730985).

Almost surely, 2^651461969 is an apocalyptic number.

It is an amenable number.

651461969 is a deficient number, since it is larger than the sum of its proper divisors (1).

651461969 is an equidigital number, since it uses as much as digits as its factorization.

651461969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 47.

The square root of 651461969 is about 25523.7530351631. The cubic root of 651461969 is about 866.8880624881. Note that the first 3 decimals are identical.

The spelling of 651461969 in words is "six hundred fifty-one million, four hundred sixty-one thousand, nine hundred sixty-nine".