291400993 has 4 divisors (see below), whose sum is σ = 313816468. Its totient is φ = 268985520.

The previous prime is 291400979. The next prime is 291400999. The reversal of 291400993 is 399004192.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 173396224 + 118004769 = 13168^2 + 10863^2 .

It is a cyclic number.

It is not a de Polignac number, because 291400993 - 2⁹ = 291400481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291400999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11207718 + ... + 11207743.

It is an arithmetic number, because the mean of its divisors is an integer number (78454117).

Almost surely, 2^291400993 is an apocalyptic number.

It is an amenable number.

291400993 is a deficient number, since it is larger than the sum of its proper divisors (22415475).

291400993 is a wasteful number, since it uses less digits than its factorization.

291400993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22415474.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 291400993 is about 17070.4713760341. The cubic root of 291400993 is about 662.9747819152.

The spelling of 291400993 in words is "two hundred ninety-one million, four hundred thousand, nine hundred ninety-three".