690810047 has 2 divisors, whose sum is σ = 690810048. Its totient is φ = 690810046.

The previous prime is 690809989. The next prime is 690810061. The reversal of 690810047 is 740018096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690810047 - 2¹⁸ = 690547903 is a prime.

It is a super-2 number, since 2×690810047² = 954437042072284418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 690809989 and 690810016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690810067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345405023 + 345405024.

It is an arithmetic number, because the mean of its divisors is an integer number (345405024).

Almost surely, 2^690810047 is an apocalyptic number.

690810047 is a deficient number, since it is larger than the sum of its proper divisors (1).

690810047 is an equidigital number, since it uses as much as digits as its factorization.

690810047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 690810047 is about 26283.2655315126. The cubic root of 690810047 is about 884.0012553472.

The spelling of 690810047 in words is "six hundred ninety million, eight hundred ten thousand, forty-seven".