245445381 has 6 divisors (see below), whose sum is σ = 354532230. Its totient is φ = 163630248.

The previous prime is 245445377. The next prime is 245445391. The reversal of 245445381 is 183544542.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 209265156 + 36180225 = 14466^2 + 6015^2 .

It is not a de Polignac number, because 245445381 - 2² = 245445377 is a prime.

It is a super-2 number, since 2×245445381² = 120486870108470322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245445301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13635846 + ... + 13635863.

It is an arithmetic number, because the mean of its divisors is an integer number (59088705).

Almost surely, 2^245445381 is an apocalyptic number.

It is an amenable number.

245445381 is a deficient number, since it is larger than the sum of its proper divisors (109086849).

245445381 is a wasteful number, since it uses less digits than its factorization.

245445381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27271715 (or 27271712 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

The square root of 245445381 is about 15666.6965567091. The cubic root of 245445381 is about 626.1114142286. Note that the first 3 decimals are identical.

The spelling of 245445381 in words is "two hundred forty-five million, four hundred forty-five thousand, three hundred eighty-one".