245117881 has 2 divisors, whose sum is σ = 245117882. Its totient is φ = 245117880.

The previous prime is 245117863. The next prime is 245117909. The reversal of 245117881 is 188711542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123765625 + 121352256 = 11125^2 + 11016^2 .

It is a cyclic number.

It is not a de Polignac number, because 245117881 - 2⁷ = 245117753 is a prime.

It is a super-2 number, since 2×245117881² = 120165551171860322, 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 245117881.

It is not a weakly prime, because it can be changed into another prime (245117861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122558940 + 122558941.

It is an arithmetic number, because the mean of its divisors is an integer number (122558941).

Almost surely, 2^245117881 is an apocalyptic number.

It is an amenable number.

245117881 is a deficient number, since it is larger than the sum of its proper divisors (1).

245117881 is an equidigital number, since it uses as much as digits as its factorization.

245117881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 37.

The square root of 245117881 is about 15656.2409600772. The cubic root of 245117881 is about 625.8328148980.

The spelling of 245117881 in words is "two hundred forty-five million, one hundred seventeen thousand, eight hundred eighty-one".