7745936121 has 135 divisors (see below), whose sum is σ = 14912562357. Its totient is φ = 3992178960.

The previous prime is 7745936063. The next prime is 7745936123. The reversal of 7745936121 is 1216395477.

The square root of 7745936121 is 88011.

It is a perfect power (a square), and thus also a powerful number.

7745936121 is a `hidden beast` number, since 77 + 459 + 3 + 6 + 121 = 666.

It is not a de Polignac number, because 7745936121 - 2¹³ = 7745927929 is a prime.

It is a super-2 number, since 2×7745936121² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7745936123) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 60991560 + ... + 60991686.

Almost surely, 2^7745936121 is an apocalyptic number.

7745936121 is the 88011-st square number.

7745936121 is the 44006-th centered octagonal number.

It is an amenable number.

7745936121 is a deficient number, since it is larger than the sum of its proper divisors (7166626236).

7745936121 is a wasteful number, since it uses less digits than its factorization.

7745936121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302 (or 148 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The cubic root of 7745936121 is about 1978.5998434463.

The spelling of 7745936121 in words is "seven billion, seven hundred forty-five million, nine hundred thirty-six thousand, one hundred twenty-one".