7965781 has 2 divisors, whose sum is σ = 7965782. Its totient is φ = 7965780.

The previous prime is 7965779. The next prime is 7965787. The reversal of 7965781 is 1875697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4100625 + 3865156 = 2025^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 7965781 - 2¹ = 7965779 is a prime.

It is a super-2 number, since 2×7965781² = 126907333879922, which contains 22 as substring.

Together with 7965779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7965787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3982890 + 3982891.

It is an arithmetic number, because the mean of its divisors is an integer number (3982891).

Almost surely, 2^7965781 is an apocalyptic number.

It is an amenable number.

7965781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7965781 is an equidigital number, since it uses as much as digits as its factorization.

7965781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The square root of 7965781 is about 2822.3715205479. The cubic root of 7965781 is about 199.7144341214.

The spelling of 7965781 in words is "seven million, nine hundred sixty-five thousand, seven hundred eighty-one".