749081321 has 4 divisors (see below), whose sum is σ = 749139600. Its totient is φ = 749023044.

The previous prime is 749081309. The next prime is 749081329. The reversal of 749081321 is 123180947.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 749081321 - 2¹⁴ = 749064937 is a prime.

It is a super-2 number, since 2×749081321² = 1122245650942210082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (749081329) 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, 431 + ... + 38708.

It is an arithmetic number, because the mean of its divisors is an integer number (187284900).

Almost surely, 2^749081321 is an apocalyptic number.

It is an amenable number.

749081321 is a deficient number, since it is larger than the sum of its proper divisors (58279).

749081321 is a wasteful number, since it uses less digits than its factorization.

749081321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58278.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 749081321 is about 27369.3500288187. The cubic root of 749081321 is about 908.1891780623.

The spelling of 749081321 in words is "seven hundred forty-nine million, eighty-one thousand, three hundred twenty-one".