245178881 has 2 divisors, whose sum is σ = 245178882. Its totient is φ = 245178880.

The previous prime is 245178859. The next prime is 245178883. The reversal of 245178881 is 188871542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245079025 + 99856 = 15655^2 + 316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245178881 is a prime.

It is a super-2 number, since 2×245178881² = 120225367376824322, which contains 22 as substring.

Together with 245178883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (245178883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122589440 + 122589441.

It is an arithmetic number, because the mean of its divisors is an integer number (122589441).

Almost surely, 2^245178881 is an apocalyptic number.

It is an amenable number.

245178881 is a deficient number, since it is larger than the sum of its proper divisors (1).

245178881 is an equidigital number, since it uses as much as digits as its factorization.

245178881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 143360, while the sum is 44.

The square root of 245178881 is about 15658.1889438083. The cubic root of 245178881 is about 625.8847254797.

The spelling of 245178881 in words is "two hundred forty-five million, one hundred seventy-eight thousand, eight hundred eighty-one".