749200121 has 4 divisors (see below), whose sum is σ = 751757412. Its totient is φ = 746642832.

The previous prime is 749200079. The next prime is 749200139. The reversal of 749200121 is 121002947.

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

It can be written as a sum of positive squares in 2 ways, for example, as 737394025 + 11806096 = 27155^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 749200121 - 2²² = 745005817 is a prime.

It is a super-2 number, since 2×749200121² = 1122601642612829282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (749200171) 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, 1278206 + ... + 1278791.

It is an arithmetic number, because the mean of its divisors is an integer number (187939353).

Almost surely, 2^749200121 is an apocalyptic number.

It is an amenable number.

749200121 is a deficient number, since it is larger than the sum of its proper divisors (2557291).

749200121 is a wasteful number, since it uses less digits than its factorization.

749200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557290.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 749200121 is about 27371.5202537236. The cubic root of 749200121 is about 908.2371867222.

The spelling of 749200121 in words is "seven hundred forty-nine million, two hundred thousand, one hundred twenty-one".