249298921 has 4 divisors (see below), whose sum is σ = 249491844. Its totient is φ = 249106000.

The previous prime is 249298919. The next prime is 249298937. The reversal of 249298921 is 129892942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129892942 = 2 ⋅64946471.

It can be written as a sum of positive squares in 2 ways, for example, as 290521 + 249008400 = 539^2 + 15780^2 .

It is a cyclic number.

It is not a de Polignac number, because 249298921 - 2¹ = 249298919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249298991) 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, 94510 + ... + 97111.

It is an arithmetic number, because the mean of its divisors is an integer number (62372961).

Almost surely, 2^249298921 is an apocalyptic number.

It is an amenable number.

249298921 is a deficient number, since it is larger than the sum of its proper divisors (192923).

249298921 is a wasteful number, since it uses less digits than its factorization.

249298921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192922.

The product of its digits is 186624, while the sum is 46.

The square root of 249298921 is about 15789.2026714461. The cubic root of 249298921 is about 629.3711041697.

The spelling of 249298921 in words is "two hundred forty-nine million, two hundred ninety-eight thousand, nine hundred twenty-one".