7491937891 has 2 divisors, whose sum is σ = 7491937892. Its totient is φ = 7491937890.

The previous prime is 7491937889. The next prime is 7491937919. The reversal of 7491937891 is 1987391947.

It is a weak prime.

It is an emirp because it is prime and its reverse (1987391947) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7491937891 - 2¹ = 7491937889 is a prime.

It is a super-2 number, since 2×7491937891² (a number of 21 digits) contains 22 as substring.

Together with 7491937889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7491937811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3745968945 + 3745968946.

It is an arithmetic number, because the mean of its divisors is an integer number (3745968946).

Almost surely, 2^7491937891 is an apocalyptic number.

7491937891 is a deficient number, since it is larger than the sum of its proper divisors (1).

7491937891 is an equidigital number, since it uses as much as digits as its factorization.

7491937891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 58.

The square root of 7491937891 is about 86555.9812549081. The cubic root of 7491937891 is about 1956.7321893488.

The spelling of 7491937891 in words is "seven billion, four hundred ninety-one million, nine hundred thirty-seven thousand, eight hundred ninety-one".