74745121 has 4 divisors (see below), whose sum is σ = 81540144. Its totient is φ = 67950100.

The previous prime is 74745119. The next prime is 74745163. The reversal of 74745121 is 12154747.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74745121 - 2¹ = 74745119 is a prime.

It is a super-2 number, since 2×74745121² = 11173666226609282, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74745521) 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, 3397495 + ... + 3397516.

It is an arithmetic number, because the mean of its divisors is an integer number (20385036).

Almost surely, 2^74745121 is an apocalyptic number.

It is an amenable number.

74745121 is a deficient number, since it is larger than the sum of its proper divisors (6795023).

74745121 is a wasteful number, since it uses less digits than its factorization.

74745121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6795022.

The product of its digits is 7840, while the sum is 31.

The square root of 74745121 is about 8645.5260684356. The cubic root of 74745121 is about 421.2380720823.

Adding to 74745121 its reverse (12154747), we get a palindrome (86899868).

The spelling of 74745121 in words is "seventy-four million, seven hundred forty-five thousand, one hundred twenty-one".