699736421 has 2 divisors, whose sum is σ = 699736422. Its totient is φ = 699736420.

The previous prime is 699736403. The next prime is 699736441. The reversal of 699736421 is 124637996.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419676196 + 280060225 = 20486^2 + 16735^2 .

It is a cyclic number.

It is not a de Polignac number, because 699736421 - 2¹⁸ = 699474277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (699736441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349868210 + 349868211.

It is an arithmetic number, because the mean of its divisors is an integer number (349868211).

Almost surely, 2^699736421 is an apocalyptic number.

It is an amenable number.

699736421 is a deficient number, since it is larger than the sum of its proper divisors (1).

699736421 is an equidigital number, since it uses as much as digits as its factorization.

699736421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 47.

The square root of 699736421 is about 26452.5314667614. The cubic root of 699736421 is about 887.7925435381.

The spelling of 699736421 in words is "six hundred ninety-nine million, seven hundred thirty-six thousand, four hundred twenty-one".