249387369891 has 32 divisors (see below), whose sum is σ = 383237913600. Its totient is φ = 142827041280.

The previous prime is 249387369883. The next prime is 249387369901. The reversal of 249387369891 is 198963783942.

It is not a de Polignac number, because 249387369891 - 2³ = 249387369883 is a prime.

It is a super-2 number, since 2×249387369891² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (249387369841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2727286 + ... + 2817243.

It is an arithmetic number, because the mean of its divisors is an integer number (11976184800).

Almost surely, 2^249387369891 is an apocalyptic number.

249387369891 is a deficient number, since it is larger than the sum of its proper divisors (133850543709).

249387369891 is a wasteful number, since it uses less digits than its factorization.

249387369891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544619.

The product of its digits is 141087744, while the sum is 69.

The spelling of 249387369891 in words is "two hundred forty-nine billion, three hundred eighty-seven million, three hundred sixty-nine thousand, eight hundred ninety-one".