7862191561 has 27 divisors (see below), whose sum is σ = 9360798951. Its totient is φ = 6584205264.

The previous prime is 7862191553. The next prime is 7862191613. The reversal of 7862191561 is 1651912687.

The square root of 7862191561 is 88669.

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

It can be written as a sum of positive squares in only one way, i.e., 5667831225 + 2194360336 = 75285^2 + 46844^2 .

It is not a de Polignac number, because 7862191561 - 2³ = 7862191553 is a prime.

It is a super-2 number, since 2×7862191561² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7862191061) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 32896080 + ... + 32896318.

Almost surely, 2^7862191561 is an apocalyptic number.

7862191561 is the 88669-th square number.

7862191561 is the 44335-th centered octagonal number.

It is an amenable number.

7862191561 is a deficient number, since it is larger than the sum of its proper divisors (1498607390).

7862191561 is an frugal number, since it uses more digits than its factorization.

7862191561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 299 counting only the distinct ones).

The product of its digits is 181440, while the sum is 46.

The cubic root of 7862191561 is about 1988.4493834660.

The spelling of 7862191561 in words is "seven billion, eight hundred sixty-two million, one hundred ninety-one thousand, five hundred sixty-one".