696139649 has 2 divisors, whose sum is σ = 696139650. Its totient is φ = 696139648.

The previous prime is 696139559. The next prime is 696139657. The reversal of 696139649 is 946931696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 540888049 + 155251600 = 23257^2 + 12460^2 .

It is a cyclic number.

It is not a de Polignac number, because 696139649 - 2⁸ = 696139393 is a prime.

It is a super-2 number, since 2×696139649² = 969220821819686402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 696139649.

It is not a weakly prime, because it can be changed into another prime (696139679) 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, 348069824 + 348069825.

It is an arithmetic number, because the mean of its divisors is an integer number (348069825).

Almost surely, 2^696139649 is an apocalyptic number.

It is an amenable number.

696139649 is a deficient number, since it is larger than the sum of its proper divisors (1).

696139649 is an equidigital number, since it uses as much as digits as its factorization.

696139649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 53.

The square root of 696139649 is about 26384.4584746400. The cubic root of 696139649 is about 886.2687915790.

The spelling of 696139649 in words is "six hundred ninety-six million, one hundred thirty-nine thousand, six hundred forty-nine".