7825212161 has 4 divisors (see below), whose sum is σ = 8427151572. Its totient is φ = 7223272752.

The previous prime is 7825212119. The next prime is 7825212163. The reversal of 7825212161 is 1612125287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1612125287 = 443 ⋅3639109.

It can be written as a sum of positive squares in 2 ways, for example, as 1212432400 + 6612779761 = 34820^2 + 81319^2 .

It is a cyclic number.

It is not a de Polignac number, because 7825212161 - 2¹⁸ = 7824950017 is a prime.

It is a super-2 number, since 2×7825212161² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7825212163) 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, 300969686 + ... + 300969711.

It is an arithmetic number, because the mean of its divisors is an integer number (2106787893).

Almost surely, 2^7825212161 is an apocalyptic number.

It is an amenable number.

7825212161 is a deficient number, since it is larger than the sum of its proper divisors (601939411).

7825212161 is a wasteful number, since it uses less digits than its factorization.

7825212161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601939410.

The product of its digits is 13440, while the sum is 35.

The square root of 7825212161 is about 88460.2292615162. The cubic root of 7825212161 is about 1985.3269609692.

The spelling of 7825212161 in words is "seven billion, eight hundred twenty-five million, two hundred twelve thousand, one hundred sixty-one".