247990291 has 8 divisors (see below), whose sum is σ = 251770464. Its totient is φ = 244218240.

The previous prime is 247990289. The next prime is 247990321. The reversal of 247990291 is 192099742.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 247990291 - 2¹ = 247990289 is a prime.

It is a super-2 number, since 2×247990291² = 122998368860529362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247990201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90741 + ... + 93433.

It is an arithmetic number, because the mean of its divisors is an integer number (31471308).

Almost surely, 2^247990291 is an apocalyptic number.

247990291 is a deficient number, since it is larger than the sum of its proper divisors (3780173).

247990291 is a wasteful number, since it uses less digits than its factorization.

247990291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 247990291 is about 15747.7074839483. The cubic root of 247990291 is about 628.2679315367.

The spelling of 247990291 in words is "two hundred forty-seven million, nine hundred ninety thousand, two hundred ninety-one".