748261993 has 2 divisors, whose sum is σ = 748261994. Its totient is φ = 748261992.

The previous prime is 748261979. The next prime is 748261999. The reversal of 748261993 is 399162847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621654489 + 126607504 = 24933^2 + 11252^2 .

It is an emirp because it is prime and its reverse (399162847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 748261993 - 2⁵ = 748261961 is a prime.

It is not a weakly prime, because it can be changed into another prime (748261999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374130996 + 374130997.

It is an arithmetic number, because the mean of its divisors is an integer number (374130997).

Almost surely, 2^748261993 is an apocalyptic number.

It is an amenable number.

748261993 is a deficient number, since it is larger than the sum of its proper divisors (1).

748261993 is an equidigital number, since it uses as much as digits as its factorization.

748261993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The square root of 748261993 is about 27354.3779494252. The cubic root of 748261993 is about 907.8579384216.

The spelling of 748261993 in words is "seven hundred forty-eight million, two hundred sixty-one thousand, nine hundred ninety-three".