249543421 has 4 divisors (see below), whose sum is σ = 249663744. Its totient is φ = 249423100.

The previous prime is 249543409. The next prime is 249543431. The reversal of 249543421 is 124345942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 249543421 - 2⁷ = 249543293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249543431) 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, 56995 + ... + 61216.

It is an arithmetic number, because the mean of its divisors is an integer number (62415936).

Almost surely, 2^249543421 is an apocalyptic number.

It is an amenable number.

249543421 is a deficient number, since it is larger than the sum of its proper divisors (120323).

249543421 is a wasteful number, since it uses less digits than its factorization.

249543421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120322.

The product of its digits is 34560, while the sum is 34.

The square root of 249543421 is about 15796.9434068746. The cubic root of 249543421 is about 629.5767889161.

The spelling of 249543421 in words is "two hundred forty-nine million, five hundred forty-three thousand, four hundred twenty-one".