191274478867 has 2 divisors, whose sum is σ = 191274478868. Its totient is φ = 191274478866.

The previous prime is 191274478841. The next prime is 191274478883. The reversal of 191274478867 is 768874472191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191274478867 - 2⁷ = 191274478739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191274478799 and 191274478808.

It is not a weakly prime, because it can be changed into another prime (191274478817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95637239433 + 95637239434.

It is an arithmetic number, because the mean of its divisors is an integer number (95637239434).

Almost surely, 2^191274478867 is an apocalyptic number.

191274478867 is a deficient number, since it is larger than the sum of its proper divisors (1).

191274478867 is an equidigital number, since it uses as much as digits as its factorization.

191274478867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37933056, while the sum is 64.

The spelling of 191274478867 in words is "one hundred ninety-one billion, two hundred seventy-four million, four hundred seventy-eight thousand, eight hundred sixty-seven".