748779991 has 2 divisors, whose sum is σ = 748779992. Its totient is φ = 748779990.

The previous prime is 748779953. The next prime is 748780001. The reversal of 748779991 is 199977847.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-748779991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (748779491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374389995 + 374389996.

It is an arithmetic number, because the mean of its divisors is an integer number (374389996).

Almost surely, 2^748779991 is an apocalyptic number.

748779991 is a deficient number, since it is larger than the sum of its proper divisors (1).

748779991 is an equidigital number, since it uses as much as digits as its factorization.

748779991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8001504, while the sum is 61.

The square root of 748779991 is about 27363.8445946471. The cubic root of 748779991 is about 908.0673838321.

It can be divided in two parts, 7487 and 79991, that added together give a palindrome (87478).

The spelling of 748779991 in words is "seven hundred forty-eight million, seven hundred seventy-nine thousand, nine hundred ninety-one".