245178889 has 4 divisors (see below), whose sum is σ = 245745556. Its totient is φ = 244612224.

The previous prime is 245178883. The next prime is 245178917. The reversal of 245178889 is 988871542.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155251600 + 89927289 = 12460^2 + 9483^2 .

It is a cyclic number.

It is not a de Polignac number, because 245178889 - 2³ = 245178881 is a prime.

It is a super-2 number, since 2×245178889² = 120225375222548642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245178881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282684 + ... + 283549.

It is an arithmetic number, because the mean of its divisors is an integer number (61436389).

Almost surely, 2^245178889 is an apocalyptic number.

It is an amenable number.

245178889 is a deficient number, since it is larger than the sum of its proper divisors (566667).

245178889 is an equidigital number, since it uses as much as digits as its factorization.

245178889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566666.

The product of its digits is 1290240, while the sum is 52.

The square root of 245178889 is about 15658.1891992657. The cubic root of 245178889 is about 625.8847322871.

The spelling of 245178889 in words is "two hundred forty-five million, one hundred seventy-eight thousand, eight hundred eighty-nine".