262009921081 has 2 divisors, whose sum is σ = 262009921082. Its totient is φ = 262009921080.

The previous prime is 262009921051. The next prime is 262009921091. The reversal of 262009921081 is 180129900262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223086182400 + 38923738681 = 472320^2 + 197291^2 .

It is a cyclic number.

It is not a de Polignac number, because 262009921081 - 2⁹ = 262009920569 is a prime.

It is a super-2 number, since 2×262009921081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (262009921051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131004960540 + 131004960541.

It is an arithmetic number, because the mean of its divisors is an integer number (131004960541).

Almost surely, 2^262009921081 is an apocalyptic number.

It is an amenable number.

262009921081 is a deficient number, since it is larger than the sum of its proper divisors (1).

262009921081 is an equidigital number, since it uses as much as digits as its factorization.

262009921081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 262009921081 in words is "two hundred sixty-two billion, nine million, nine hundred twenty-one thousand, eighty-one".