7916489261 has 2 divisors, whose sum is σ = 7916489262. Its totient is φ = 7916489260.

The previous prime is 7916489219. The next prime is 7916489311. The reversal of 7916489261 is 1629846197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6481216036 + 1435273225 = 80506^2 + 37885^2 .

It is a cyclic number.

It is not a de Polignac number, because 7916489261 - 2¹⁴ = 7916472877 is a prime.

It is a super-2 number, since 2×7916489261² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7916489201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3958244630 + 3958244631.

It is an arithmetic number, because the mean of its divisors is an integer number (3958244631).

Almost surely, 2^7916489261 is an apocalyptic number.

It is an amenable number.

7916489261 is a deficient number, since it is larger than the sum of its proper divisors (1).

7916489261 is an equidigital number, since it uses as much as digits as its factorization.

7916489261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 53.

The square root of 7916489261 is about 88974.6551608940. The cubic root of 7916489261 is about 1993.0164149023.

The spelling of 7916489261 in words is "seven billion, nine hundred sixteen million, four hundred eighty-nine thousand, two hundred sixty-one".