7099787521 has 4 divisors (see below), whose sum is σ = 7099989844. Its totient is φ = 7099585200.

The previous prime is 7099787507. The next prime is 7099787543. The reversal of 7099787521 is 1257879907.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1257879907 = 8431 ⋅149197.

It can be written as a sum of positive squares in 2 ways, for example, as 3006986896 + 4092800625 = 54836^2 + 63975^2 .

It is a cyclic number.

It is not a de Polignac number, because 7099787521 - 2⁵ = 7099787489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7099707521) 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, 33390 + ... + 123751.

It is an arithmetic number, because the mean of its divisors is an integer number (1774997461).

Almost surely, 2^7099787521 is an apocalyptic number.

It is an amenable number.

7099787521 is a deficient number, since it is larger than the sum of its proper divisors (202323).

7099787521 is a wasteful number, since it uses less digits than its factorization.

7099787521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202322.

The product of its (nonzero) digits is 2222640, while the sum is 55.

The square root of 7099787521 is about 84260.2368914306. The cubic root of 7099787521 is about 1921.9781696222.

The spelling of 7099787521 in words is "seven billion, ninety-nine million, seven hundred eighty-seven thousand, five hundred twenty-one".