291720493 has 8 divisors (see below), whose sum is σ = 315453312. Its totient is φ = 268718016.

The previous prime is 291720491. The next prime is 291720497. The reversal of 291720493 is 394027192.

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 291720493 - 2¹ = 291720491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291720491) 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, 181755 + ... + 183352.

It is an arithmetic number, because the mean of its divisors is an integer number (39431664).

Almost surely, 2^291720493 is an apocalyptic number.

It is an amenable number.

291720493 is a deficient number, since it is larger than the sum of its proper divisors (23732819).

291720493 is a wasteful number, since it uses less digits than its factorization.

291720493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365171.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 291720493 is about 17079.8270775790. The cubic root of 291720493 is about 663.2169946276.

The spelling of 291720493 in words is "two hundred ninety-one million, seven hundred twenty thousand, four hundred ninety-three".