749509213 has 4 divisors (see below), whose sum is σ = 756514080. Its totient is φ = 742504348.

The previous prime is 749509181. The next prime is 749509217. The reversal of 749509213 is 312905947.

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 not a de Polignac number, because 749509213 - 2⁵ = 749509181 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749509217) 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, 3502273 + ... + 3502486.

It is an arithmetic number, because the mean of its divisors is an integer number (189128520).

Almost surely, 2^749509213 is an apocalyptic number.

It is an amenable number.

749509213 is a deficient number, since it is larger than the sum of its proper divisors (7004867).

749509213 is a wasteful number, since it uses less digits than its factorization.

749509213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7004866.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 749509213 is about 27377.1659051846. The cubic root of 749509213 is about 908.3620711349.

The spelling of 749509213 in words is "seven hundred forty-nine million, five hundred nine thousand, two hundred thirteen".