249403381 has 4 divisors (see below), whose sum is σ = 249799264. Its totient is φ = 249007500.

The previous prime is 249403361. The next prime is 249403387. The reversal of 249403381 is 183304942.

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 249403381 - 2¹⁹ = 248879093 is a prime.

It is a super-2 number, since 2×249403381² = 124404092908462322, 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 (249403387) 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, 196995 + ... + 198256.

It is an arithmetic number, because the mean of its divisors is an integer number (62449816).

Almost surely, 2^249403381 is an apocalyptic number.

It is an amenable number.

249403381 is a deficient number, since it is larger than the sum of its proper divisors (395883).

249403381 is an equidigital number, since it uses as much as digits as its factorization.

249403381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395882.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 249403381 is about 15792.5102817760. The cubic root of 249403381 is about 629.4589972164.

The spelling of 249403381 in words is "two hundred forty-nine million, four hundred three thousand, three hundred eighty-one".