749139121 has 8 divisors (see below), whose sum is σ = 756451584. Its totient is φ = 741860640.

The previous prime is 749139103. The next prime is 749139133. The reversal of 749139121 is 121931947.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 749139121 - 2¹⁵ = 749106353 is a prime.

It is a super-2 number, since 2×749139121² = 1122418845225305282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (749139161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36981 + ... + 53533.

It is an arithmetic number, because the mean of its divisors is an integer number (94556448).

Almost surely, 2^749139121 is an apocalyptic number.

It is an amenable number.

749139121 is a deficient number, since it is larger than the sum of its proper divisors (7312463).

749139121 is a wasteful number, since it uses less digits than its factorization.

749139121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16991.

The product of its digits is 13608, while the sum is 37.

The square root of 749139121 is about 27370.4059341472. The cubic root of 749139121 is about 908.2125364449.

The spelling of 749139121 in words is "seven hundred forty-nine million, one hundred thirty-nine thousand, one hundred twenty-one".