291144661 has 8 divisors (see below), whose sum is σ = 295011360. Its totient is φ = 287286672.

The previous prime is 291144631. The next prime is 291144677. The reversal of 291144661 is 166441192.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291144661 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 (291144631) 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, 90466 + ... + 93628.

It is an arithmetic number, because the mean of its divisors is an integer number (36876420).

Almost surely, 2^291144661 is an apocalyptic number.

It is an amenable number.

291144661 is a deficient number, since it is larger than the sum of its proper divisors (3866699).

291144661 is a wasteful number, since it uses less digits than its factorization.

291144661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4355.

The product of its digits is 10368, while the sum is 34.

The square root of 291144661 is about 17062.9616714098. The cubic root of 291144661 is about 662.7803287846.

The spelling of 291144661 in words is "two hundred ninety-one million, one hundred forty-four thousand, six hundred sixty-one".