262821961 has 2 divisors, whose sum is σ = 262821962. Its totient is φ = 262821960.

The previous prime is 262821959. The next prime is 262821967. The reversal of 262821961 is 169128262.

262821961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241615936 + 21206025 = 15544^2 + 4605^2 .

It is a cyclic number.

It is not a de Polignac number, because 262821961 - 2¹ = 262821959 is a prime.

Together with 262821959, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 262821961.

It is not a weakly prime, because it can be changed into another prime (262821967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131410980 + 131410981.

It is an arithmetic number, because the mean of its divisors is an integer number (131410981).

Almost surely, 2^262821961 is an apocalyptic number.

It is an amenable number.

262821961 is a deficient number, since it is larger than the sum of its proper divisors (1).

262821961 is an equidigital number, since it uses as much as digits as its factorization.

262821961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 262821961 is about 16211.7846334079. The cubic root of 262821961 is about 640.5512511288.

The spelling of 262821961 in words is "two hundred sixty-two million, eight hundred twenty-one thousand, nine hundred sixty-one".