745736121 has 12 divisors (see below), whose sum is σ = 1160034148. Its totient is φ = 458914464.

The previous prime is 745736119. The next prime is 745736177. The reversal of 745736121 is 121637547.

It is a happy number.

745736121 is a `hidden beast` number, since 7 + 4 + 573 + 61 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 465006096 + 280730025 = 21564^2 + 16755^2 .

It is not a de Polignac number, because 745736121 - 2¹ = 745736119 is a prime.

It is a super-2 number, since 2×745736121² = 1112244724328253282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (745736191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3186790 + ... + 3187023.

Almost surely, 2^745736121 is an apocalyptic number.

It is an amenable number.

745736121 is a deficient number, since it is larger than the sum of its proper divisors (414298027).

745736121 is a wasteful number, since it uses less digits than its factorization.

745736121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6373832 (or 6373829 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 745736121 is about 27308.1694919304. The cubic root of 745736121 is about 906.8352493587.

The spelling of 745736121 in words is "seven hundred forty-five million, seven hundred thirty-six thousand, one hundred twenty-one".