7000161521 has 2 divisors, whose sum is σ = 7000161522. Its totient is φ = 7000161520.

The previous prime is 7000161473. The next prime is 7000161559. The reversal of 7000161521 is 1251610007.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4142724496 + 2857437025 = 64364^2 + 53455^2 .

It is a cyclic number.

It is not a de Polignac number, because 7000161521 - 2²⁶ = 6933052657 is a prime.

It is a super-2 number, since 2×7000161521² = 98004522640178066882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7000166521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3500080760 + 3500080761.

It is an arithmetic number, because the mean of its divisors is an integer number (3500080761).

Almost surely, 2^7000161521 is an apocalyptic number.

It is an amenable number.

7000161521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7000161521 is an equidigital number, since it uses as much as digits as its factorization.

7000161521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 7000161521 is about 83666.9679204404. The cubic root of 7000161521 is about 1912.9458959239.

Adding to 7000161521 its reverse (1251610007), we get a palindrome (8251771528).

The spelling of 7000161521 in words is "seven billion, one hundred sixty-one thousand, five hundred twenty-one".