7681969 has 2 divisors, whose sum is σ = 7681970. Its totient is φ = 7681968.

The previous prime is 7681939. The next prime is 7681991. The reversal of 7681969 is 9691867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5688225 + 1993744 = 2385^2 + 1412^2 .

It is a cyclic number.

It is not a de Polignac number, because 7681969 - 2⁵ = 7681937 is a prime.

It is a super-2 number, since 2×7681969² = 118025295433922, which contains 22 as substring.

7681969 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7681939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3840984 + 3840985.

It is an arithmetic number, because the mean of its divisors is an integer number (3840985).

Almost surely, 2^7681969 is an apocalyptic number.

It is an amenable number.

7681969 is a deficient number, since it is larger than the sum of its proper divisors (1).

7681969 is an equidigital number, since it uses as much as digits as its factorization.

7681969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 7681969 is about 2771.6365201808. The cubic root of 7681969 is about 197.3138255181.

The spelling of 7681969 in words is "seven million, six hundred eighty-one thousand, nine hundred sixty-nine".