691486249 has 2 divisors, whose sum is σ = 691486250. Its totient is φ = 691486248.

The previous prime is 691486241. The next prime is 691486259. The reversal of 691486249 is 942684196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491065600 + 200420649 = 22160^2 + 14157^2 .

It is a cyclic number.

It is not a de Polignac number, because 691486249 - 2³ = 691486241 is a prime.

It is not a weakly prime, because it can be changed into another prime (691486241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345743124 + 345743125.

It is an arithmetic number, because the mean of its divisors is an integer number (345743125).

Almost surely, 2^691486249 is an apocalyptic number.

It is an amenable number.

691486249 is a deficient number, since it is larger than the sum of its proper divisors (1).

691486249 is an equidigital number, since it uses as much as digits as its factorization.

691486249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 49.

The square root of 691486249 is about 26296.1261215412. The cubic root of 691486249 is about 884.2895972653.

The spelling of 691486249 in words is "six hundred ninety-one million, four hundred eighty-six thousand, two hundred forty-nine".