696220991 has 2 divisors, whose sum is σ = 696220992. Its totient is φ = 696220990.

The previous prime is 696220963. The next prime is 696220997. The reversal of 696220991 is 199022696.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 696220991 - 2⁶ = 696220927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (696220997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348110495 + 348110496.

It is an arithmetic number, because the mean of its divisors is an integer number (348110496).

Almost surely, 2^696220991 is an apocalyptic number.

696220991 is a deficient number, since it is larger than the sum of its proper divisors (1).

696220991 is an equidigital number, since it uses as much as digits as its factorization.

696220991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 696220991 is about 26385.9999052528. Note that the first 4 decimals coincide. The cubic root of 696220991 is about 886.3033095900.

The spelling of 696220991 in words is "six hundred ninety-six million, two hundred twenty thousand, nine hundred ninety-one".