245304981 has 18 divisors (see below), whose sum is σ = 362785878. Its totient is φ = 159722640.

The previous prime is 245304979. The next prime is 245305007. The reversal of 245304981 is 189403542.

245304981 is a `hidden beast` number, since 2 + 4 + 530 + 49 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 243640881 + 1664100 = 15609^2 + 1290^2 .

It is not a de Polignac number, because 245304981 - 2¹ = 245304979 is a prime.

It is a super-3 number, since 3×245304981³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245304901) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9271 + ... + 24011.

It is an arithmetic number, because the mean of its divisors is an integer number (20154771).

Almost surely, 2^245304981 is an apocalyptic number.

It is an amenable number.

245304981 is a deficient number, since it is larger than the sum of its proper divisors (117480897).

245304981 is a wasteful number, since it uses less digits than its factorization.

245304981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14833 (or 14787 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 245304981 is about 15662.2150732264. The cubic root of 245304981 is about 625.9920084245.

The spelling of 245304981 in words is "two hundred forty-five million, three hundred four thousand, nine hundred eighty-one".