7748135891 has 2 divisors, whose sum is σ = 7748135892. Its totient is φ = 7748135890.

The previous prime is 7748135887. The next prime is 7748135893. The reversal of 7748135891 is 1985318477.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7748135891 - 2² = 7748135887 is a prime.

Together with 7748135893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7748135893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3874067945 + 3874067946.

It is an arithmetic number, because the mean of its divisors is an integer number (3874067946).

Almost surely, 2^7748135891 is an apocalyptic number.

7748135891 is a deficient number, since it is larger than the sum of its proper divisors (1).

7748135891 is an equidigital number, since it uses as much as digits as its factorization.

7748135891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 53.

The square root of 7748135891 is about 88023.4962439007. The cubic root of 7748135891 is about 1978.7871267114.

The spelling of 7748135891 in words is "seven billion, seven hundred forty-eight million, one hundred thirty-five thousand, eight hundred ninety-one".