745412121 has 6 divisors (see below), whose sum is σ = 1076706410. Its totient is φ = 496941408.

The previous prime is 745412099. The next prime is 745412137. The reversal of 745412121 is 121214547.

It can be written as a sum of positive squares in only one way, i.e., 743162121 + 2250000 = 27261^2 + 1500^2 .

It is not a de Polignac number, because 745412121 - 2⁹ = 745411609 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745410121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41411776 + ... + 41411793.

Almost surely, 2^745412121 is an apocalyptic number.

It is an amenable number.

745412121 is a deficient number, since it is larger than the sum of its proper divisors (331294289).

745412121 is a wasteful number, since it uses less digits than its factorization.

745412121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82823575 (or 82823572 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 745412121 is about 27302.2365567365. The cubic root of 745412121 is about 906.7038994195.

Adding to 745412121 its reverse (121214547), we get a palindrome (866626668).

The spelling of 745412121 in words is "seven hundred forty-five million, four hundred twelve thousand, one hundred twenty-one".