249461021 has 4 divisors (see below), whose sum is σ = 249608700. Its totient is φ = 249313344.

The previous prime is 249460973. The next prime is 249461029. The reversal of 249461021 is 120164942.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61387225 + 188073796 = 7835^2 + 13714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249461021 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 (249461029) 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, 71276 + ... + 74693.

It is an arithmetic number, because the mean of its divisors is an integer number (62402175).

Almost surely, 2^249461021 is an apocalyptic number.

It is an amenable number.

249461021 is a deficient number, since it is larger than the sum of its proper divisors (147679).

249461021 is a wasteful number, since it uses less digits than its factorization.

249461021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147678.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 249461021 is about 15794.3350920512. The cubic root of 249461021 is about 629.5074852277.

The spelling of 249461021 in words is "two hundred forty-nine million, four hundred sixty-one thousand, twenty-one".