749172878891 has 4 divisors (see below), whose sum is σ = 773339745984. Its totient is φ = 725006011800.

The previous prime is 749172878879. The next prime is 749172878903. The reversal of 749172878891 is 198878271947.

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

It is an interprime number because it is at equal distance from previous prime (749172878879) and next prime (749172878903).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-749172878891 is a prime.

It is a super-2 number, since 2×749172878891² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (749172878821) 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, 12083433500 + ... + 12083433561.

It is an arithmetic number, because the mean of its divisors is an integer number (193334936496).

Almost surely, 2^749172878891 is an apocalyptic number.

749172878891 is a deficient number, since it is larger than the sum of its proper divisors (24166867093).

749172878891 is a wasteful number, since it uses less digits than its factorization.

749172878891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24166867092.

The product of its digits is 113799168, while the sum is 71.

The spelling of 749172878891 in words is "seven hundred forty-nine billion, one hundred seventy-two million, eight hundred seventy-eight thousand, eight hundred ninety-one".