699377561 has 2 divisors, whose sum is σ = 699377562. Its totient is φ = 699377560.

The previous prime is 699377551. The next prime is 699377683. The reversal of 699377561 is 165773996.

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., 582305161 + 117072400 = 24131^2 + 10820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-699377561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (699377551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349688780 + 349688781.

It is an arithmetic number, because the mean of its divisors is an integer number (349688781).

Almost surely, 2^699377561 is an apocalyptic number.

It is an amenable number.

699377561 is a deficient number, since it is larger than the sum of its proper divisors (1).

699377561 is an equidigital number, since it uses as much as digits as its factorization.

699377561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2143260, while the sum is 53.

The square root of 699377561 is about 26445.7475031431. The cubic root of 699377561 is about 887.6407493760.

The spelling of 699377561 in words is "six hundred ninety-nine million, three hundred seventy-seven thousand, five hundred sixty-one".