7812969145 has 4 divisors (see below), whose sum is σ = 9375562980. Its totient is φ = 6250375312.

The previous prime is 7812969133. The next prime is 7812969163. The reversal of 7812969145 is 5419692187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4466115241 + 3346853904 = 66829^2 + 57852^2 .

It is a cyclic number.

It is not a de Polignac number, because 7812969145 - 2¹⁷ = 7812838073 is a prime.

It is a super-2 number, since 2×7812969145² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7812969092 and 7812969101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781296910 + ... + 781296919.

It is an arithmetic number, because the mean of its divisors is an integer number (2343890745).

Almost surely, 2^7812969145 is an apocalyptic number.

It is an amenable number.

7812969145 is a deficient number, since it is larger than the sum of its proper divisors (1562593835).

7812969145 is a wasteful number, since it uses less digits than its factorization.

7812969145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562593834.

The product of its digits is 1088640, while the sum is 52.

The square root of 7812969145 is about 88391.0014933647. The cubic root of 7812969145 is about 1984.2910326328.

The spelling of 7812969145 in words is "seven billion, eight hundred twelve million, nine hundred sixty-nine thousand, one hundred forty-five".