291478388263 has 2 divisors, whose sum is σ = 291478388264. Its totient is φ = 291478388262.

The previous prime is 291478388239. The next prime is 291478388287. The reversal of 291478388263 is 362883874192.

It is a balanced prime because it is at equal distance from previous prime (291478388239) and next prime (291478388287).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291478388263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291478388233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145739194131 + 145739194132.

It is an arithmetic number, because the mean of its divisors is an integer number (145739194132).

Almost surely, 2^291478388263 is an apocalyptic number.

291478388263 is a deficient number, since it is larger than the sum of its proper divisors (1).

291478388263 is an equidigital number, since it uses as much as digits as its factorization.

291478388263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27869184, while the sum is 61.

The spelling of 291478388263 in words is "two hundred ninety-one billion, four hundred seventy-eight million, three hundred eighty-eight thousand, two hundred sixty-three".