291040047 has 10 divisors (see below), whose sum is σ = 434763648. Its totient is φ = 194026644.

The previous prime is 291040037. The next prime is 291040063. The reversal of 291040047 is 740040192.

It is a happy number.

It is not a de Polignac number, because 291040047 - 2²⁷ = 156822319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 291040047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291040037) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1796463 + ... + 1796624.

Almost surely, 2^291040047 is an apocalyptic number.

291040047 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

291040047 is a deficient number, since it is larger than the sum of its proper divisors (143723601).

291040047 is an equidigital number, since it uses as much as digits as its factorization.

291040047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593099 (or 3593090 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 291040047 is about 17059.8958672086. The cubic root of 291040047 is about 662.7009359410.

The spelling of 291040047 in words is "two hundred ninety-one million, forty thousand, forty-seven".