690671479 has 2 divisors, whose sum is σ = 690671480. Its totient is φ = 690671478.

The previous prime is 690671473. The next prime is 690671491. The reversal of 690671479 is 974176096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690671479 - 2¹¹ = 690669431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690671473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345335739 + 345335740.

It is an arithmetic number, because the mean of its divisors is an integer number (345335740).

Almost surely, 2^690671479 is an apocalyptic number.

690671479 is a deficient number, since it is larger than the sum of its proper divisors (1).

690671479 is an equidigital number, since it uses as much as digits as its factorization.

690671479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 690671479 is about 26280.6293493896. The cubic root of 690671479 is about 883.9421448012.

The spelling of 690671479 in words is "six hundred ninety million, six hundred seventy-one thousand, four hundred seventy-nine".