699127421 has 2 divisors, whose sum is σ = 699127422. Its totient is φ = 699127420.

The previous prime is 699127409. The next prime is 699127441. The reversal of 699127421 is 124721996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 697699396 + 1428025 = 26414^2 + 1195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-699127421 is a prime.

It is a super-2 number, since 2×699127421² = 977558301588222482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (699127441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349563710 + 349563711.

It is an arithmetic number, because the mean of its divisors is an integer number (349563711).

Almost surely, 2^699127421 is an apocalyptic number.

It is an amenable number.

699127421 is a deficient number, since it is larger than the sum of its proper divisors (1).

699127421 is an equidigital number, since it uses as much as digits as its factorization.

699127421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 699127421 is about 26441.0177754186. The cubic root of 699127421 is about 887.5349119639.

The spelling of 699127421 in words is "six hundred ninety-nine million, one hundred twenty-seven thousand, four hundred twenty-one".