215011110491 has 2 divisors, whose sum is σ = 215011110492. Its totient is φ = 215011110490.

The previous prime is 215011110451. The next prime is 215011110527. The reversal of 215011110491 is 194011110512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215011110491 is a prime.

It is a super-2 number, since 2×215011110491² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215011110491.

It is not a weakly prime, because it can be changed into another prime (215011110451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107505555245 + 107505555246.

It is an arithmetic number, because the mean of its divisors is an integer number (107505555246).

Almost surely, 2^215011110491 is an apocalyptic number.

215011110491 is a deficient number, since it is larger than the sum of its proper divisors (1).

215011110491 is an equidigital number, since it uses as much as digits as its factorization.

215011110491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 26.

The spelling of 215011110491 in words is "two hundred fifteen billion, eleven million, one hundred ten thousand, four hundred ninety-one".