245191081 has 2 divisors, whose sum is σ = 245191082. Its totient is φ = 245191080.

The previous prime is 245191061. The next prime is 245191169. The reversal of 245191081 is 180191542.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170955625 + 74235456 = 13075^2 + 8616^2 .

It is a cyclic number.

It is not a de Polignac number, because 245191081 - 2¹¹ = 245189033 is a prime.

It is a super-2 number, since 2×245191081² = 120237332403897122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (245191061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122595540 + 122595541.

It is an arithmetic number, because the mean of its divisors is an integer number (122595541).

Almost surely, 2^245191081 is an apocalyptic number.

It is an amenable number.

245191081 is a deficient number, since it is larger than the sum of its proper divisors (1).

245191081 is an equidigital number, since it uses as much as digits as its factorization.

245191081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 245191081 is about 15658.5785114741. The cubic root of 245191081 is about 625.8951065628.

It can be divided in two parts, 24519 and 1081, that added together give a square (25600 = 160²).

The spelling of 245191081 in words is "two hundred forty-five million, one hundred ninety-one thousand, eighty-one".