243897313149 has 48 divisors (see below), whose sum is σ = 409362937984. Its totient is φ = 137038780800.

The previous prime is 243897313139. The next prime is 243897313157. The reversal of 243897313149 is 941313798342.

243897313149 is a `hidden beast` number, since 2 + 438 + 9 + 73 + 131 + 4 + 9 = 666.

It is not a de Polignac number, because 243897313149 - 2¹⁷ = 243897182077 is a prime.

It is a super-2 number, since 2×243897313149² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243897313095 and 243897313104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243897313139) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13599102 + ... + 13617024.

Almost surely, 2^243897313149 is an apocalyptic number.

It is an amenable number.

243897313149 is a deficient number, since it is larger than the sum of its proper divisors (165465624835).

243897313149 is a wasteful number, since it uses less digits than its factorization.

243897313149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21538 (or 21535 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 243897313149 in words is "two hundred forty-three billion, eight hundred ninety-seven million, three hundred thirteen thousand, one hundred forty-nine".