247090509 has 6 divisors (see below), whose sum is σ = 356908526. Its totient is φ = 164727000.

The previous prime is 247090471. The next prime is 247090517. The reversal of 247090509 is 905090742.

It can be written as a sum of positive squares in only one way, i.e., 149377284 + 97713225 = 12222^2 + 9885^2 .

It is not a de Polignac number, because 247090509 - 2⁷ = 247090381 is a prime.

It is a super-2 number, since 2×247090509² = 122107439275758162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247090549) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13727242 + ... + 13727259.

Almost surely, 2^247090509 is an apocalyptic number.

It is an amenable number.

247090509 is a deficient number, since it is larger than the sum of its proper divisors (109818017).

247090509 is a wasteful number, since it uses less digits than its factorization.

247090509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27454507 (or 27454504 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 247090509 is about 15719.1128566468. The cubic root of 247090509 is about 627.5071635082.

The spelling of 247090509 in words is "two hundred forty-seven million, ninety thousand, five hundred nine".