6426191491 has 4 divisors (see below), whose sum is σ = 6476791552. Its totient is φ = 6375591432.

The previous prime is 6426191483. The next prime is 6426191501. The reversal of 6426191491 is 1941916246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1941916246 = 2 ⋅970958123.

It is a cyclic number.

It is not a de Polignac number, because 6426191491 - 2³ = 6426191483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6426198491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25299840 + ... + 25300093.

It is an arithmetic number, because the mean of its divisors is an integer number (1619197888).

Almost surely, 2^6426191491 is an apocalyptic number.

6426191491 is a deficient number, since it is larger than the sum of its proper divisors (50600061).

6426191491 is a wasteful number, since it uses less digits than its factorization.

6426191491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50600060.

The product of its digits is 93312, while the sum is 43.

The square root of 6426191491 is about 80163.5296815204. The cubic root of 6426191491 is about 1859.1647973927.

The spelling of 6426191491 in words is "six billion, four hundred twenty-six million, one hundred ninety-one thousand, four hundred ninety-one".