249987061 has 4 divisors (see below), whose sum is σ = 254703852. Its totient is φ = 245270272.

The previous prime is 249987053. The next prime is 249987097. The reversal of 249987061 is 160789942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 160789942 = 2 ⋅80394971.

It can be written as a sum of positive squares in 2 ways, for example, as 192682161 + 57304900 = 13881^2 + 7570^2 .

It is a cyclic number.

It is not a de Polignac number, because 249987061 - 2³ = 249987053 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 (249987011) 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, 2358316 + ... + 2358421.

It is an arithmetic number, because the mean of its divisors is an integer number (63675963).

Almost surely, 2^249987061 is an apocalyptic number.

It is an amenable number.

249987061 is a deficient number, since it is larger than the sum of its proper divisors (4716791).

249987061 is an equidigital number, since it uses as much as digits as its factorization.

249987061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4716790.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 249987061 is about 15810.9791284411. The cubic root of 249987061 is about 629.9496566810.

The spelling of 249987061 in words is "two hundred forty-nine million, nine hundred eighty-seven thousand, sixty-one".