745012121 has 8 divisors (see below), whose sum is σ = 868819200. Its totient is φ = 638581524.

The previous prime is 745012091. The next prime is 745012127. The reversal of 745012121 is 121210547.

It is a de Polignac number, because none of the positive numbers 2^k-745012121 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 (745012127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1085681 + ... + 1086366.

It is an arithmetic number, because the mean of its divisors is an integer number (108602400).

Almost surely, 2^745012121 is an apocalyptic number.

It is an amenable number.

745012121 is a deficient number, since it is larger than the sum of its proper divisors (123807079).

745012121 is an equidigital number, since it uses as much as digits as its factorization.

745012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172068 (or 2172054 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 745012121 is about 27294.9101665494. The cubic root of 745012121 is about 906.5416864895.

Adding to 745012121 its reverse (121210547), we get a palindrome (866222668).

The spelling of 745012121 in words is "seven hundred forty-five million, twelve thousand, one hundred twenty-one".