249404471 has 2 divisors, whose sum is σ = 249404472. Its totient is φ = 249404470.

The previous prime is 249404453. The next prime is 249404473. The reversal of 249404471 is 174404942.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249404471 is a prime.

It is a super-3 number, since 3×249404471³ (a number of 26 digits) contains 333 as substring.

Together with 249404473, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249404473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124702235 + 124702236.

It is an arithmetic number, because the mean of its divisors is an integer number (124702236).

Almost surely, 2^249404471 is an apocalyptic number.

249404471 is a deficient number, since it is larger than the sum of its proper divisors (1).

249404471 is an equidigital number, since it uses as much as digits as its factorization.

249404471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 249404471 is about 15792.5447917680. The cubic root of 249404471 is about 629.4599142172.

The spelling of 249404471 in words is "two hundred forty-nine million, four hundred four thousand, four hundred seventy-one".