749279617391 has 4 divisors (see below), whose sum is σ = 749451356712. Its totient is φ = 749107878072.

The previous prime is 749279617313. The next prime is 749279617417. The reversal of 749279617391 is 193716972947.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 749279617391 - 2³⁰ = 748205875567 is a prime.

It is a super-2 number, since 2×749279617391² (a number of 25 digits) 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 (749279697391) 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, 85863116 + ... + 85871841.

It is an arithmetic number, because the mean of its divisors is an integer number (187362839178).

Almost surely, 2^749279617391 is an apocalyptic number.

749279617391 is a deficient number, since it is larger than the sum of its proper divisors (171739321).

749279617391 is a wasteful number, since it uses less digits than its factorization.

749279617391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171739320.

The product of its digits is 36006768, while the sum is 65.

The spelling of 749279617391 in words is "seven hundred forty-nine billion, two hundred seventy-nine million, six hundred seventeen thousand, three hundred ninety-one".