749379991 has 4 divisors (see below), whose sum is σ = 749462112. Its totient is φ = 749297872.

The previous prime is 749379989. The next prime is 749380003. The reversal of 749379991 is 199973947.

749379991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 199973947 = 811 ⋅246577.

It is a cyclic number.

It is not a de Polignac number, because 749379991 - 2¹ = 749379989 is a prime.

It is a super-2 number, since 2×749379991² = 1123140741822320162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749379971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25375 + ... + 46288.

It is an arithmetic number, because the mean of its divisors is an integer number (187365528).

Almost surely, 2^749379991 is an apocalyptic number.

749379991 is a deficient number, since it is larger than the sum of its proper divisors (82121).

749379991 is a wasteful number, since it uses less digits than its factorization.

749379991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82120.

The product of its digits is 3857868, while the sum is 58.

The square root of 749379991 is about 27374.8057710005. The cubic root of 749379991 is about 908.3098649231.

The spelling of 749379991 in words is "seven hundred forty-nine million, three hundred seventy-nine thousand, nine hundred ninety-one".