1765879961 has 2 divisors, whose sum is σ = 1765879962. Its totient is φ = 1765879960.

The previous prime is 1765879943. The next prime is 1765879967. The reversal of 1765879961 is 1699785671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1741476361 + 24403600 = 41731^2 + 4940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1765879961 is a prime.

It is a super-2 number, since 2×1765879961² = 6236664073322723042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1765879961.

It is not a weakly prime, because it can be changed into another prime (1765879967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 882939980 + 882939981.

It is an arithmetic number, because the mean of its divisors is an integer number (882939981).

Almost surely, 2^1765879961 is an apocalyptic number.

It is an amenable number.

1765879961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1765879961 is an equidigital number, since it uses as much as digits as its factorization.

1765879961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 59.

The square root of 1765879961 is about 42022.3745283391. The cubic root of 1765879961 is about 1208.7052062721.

The spelling of 1765879961 in words is "one billion, seven hundred sixty-five million, eight hundred seventy-nine thousand, nine hundred sixty-one".