245266981 has 4 divisors (see below), whose sum is σ = 245445964. Its totient is φ = 245088000.

The previous prime is 245266943. The next prime is 245267003. The reversal of 245266981 is 189662542.

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 61230625 + 184036356 = 7825^2 + 13566^2 .

It is a cyclic number.

It is not a de Polignac number, because 245266981 - 2²³ = 236878373 is a prime.

It is a super-2 number, since 2×245266981² = 120311783937708722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245266781) 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, 87420 + ... + 90181.

It is an arithmetic number, because the mean of its divisors is an integer number (61361491).

Almost surely, 2^245266981 is an apocalyptic number.

It is an amenable number.

245266981 is a deficient number, since it is larger than the sum of its proper divisors (178983).

245266981 is a wasteful number, since it uses less digits than its factorization.

245266981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178982.

The product of its digits is 207360, while the sum is 43.

The square root of 245266981 is about 15661.0019155864. The cubic root of 245266981 is about 625.9596827801.

The spelling of 245266981 in words is "two hundred forty-five million, two hundred sixty-six thousand, nine hundred eighty-one".