749104721 has 4 divisors (see below), whose sum is σ = 751060992. Its totient is φ = 747148452.

The previous prime is 749104669. The next prime is 749104787. The reversal of 749104721 is 127401947.

749104721 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-749104721 is a prime.

It is a super-2 number, since 2×749104721² = 1122315766048975682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (749104121) 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, 977561 + ... + 978326.

It is an arithmetic number, because the mean of its divisors is an integer number (187765248).

Almost surely, 2^749104721 is an apocalyptic number.

It is an amenable number.

749104721 is a deficient number, since it is larger than the sum of its proper divisors (1956271).

749104721 is a wasteful number, since it uses less digits than its factorization.

749104721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956270.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 749104721 is about 27369.7775109700. Note that the first 3 decimals coincide. The cubic root of 749104721 is about 908.1986347149.

The spelling of 749104721 in words is "seven hundred forty-nine million, one hundred four thousand, seven hundred twenty-one".