690971471 has 2 divisors, whose sum is σ = 690971472. Its totient is φ = 690971470.

The previous prime is 690971467. The next prime is 690971473. The reversal of 690971471 is 174179096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690971471 - 2² = 690971467 is a prime.

It is a super-3 number, since 3×690971471³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 690971473, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690971473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345485735 + 345485736.

It is an arithmetic number, because the mean of its divisors is an integer number (345485736).

Almost surely, 2^690971471 is an apocalyptic number.

690971471 is a deficient number, since it is larger than the sum of its proper divisors (1).

690971471 is an equidigital number, since it uses as much as digits as its factorization.

690971471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 690971471 is about 26286.3362034347. The cubic root of 690971471 is about 884.0701058731.

The spelling of 690971471 in words is "six hundred ninety million, nine hundred seventy-one thousand, four hundred seventy-one".