651779969 has 2 divisors, whose sum is σ = 651779970. Its totient is φ = 651779968.

The previous prime is 651779963. The next prime is 651780001. The reversal of 651779969 is 969977156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532686400 + 119093569 = 23080^2 + 10913^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651779969 is a prime.

It is a super-2 number, since 2×651779969² = 849634255979281922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (651779963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325889984 + 325889985.

It is an arithmetic number, because the mean of its divisors is an integer number (325889985).

Almost surely, 2^651779969 is an apocalyptic number.

It is an amenable number.

651779969 is a deficient number, since it is larger than the sum of its proper divisors (1).

651779969 is an equidigital number, since it uses as much as digits as its factorization.

651779969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6429780, while the sum is 59.

The square root of 651779969 is about 25529.9817665426. The cubic root of 651779969 is about 867.0290917293.

The spelling of 651779969 in words is "six hundred fifty-one million, seven hundred seventy-nine thousand, nine hundred sixty-nine".