249650641 has 2 divisors, whose sum is σ = 249650642. Its totient is φ = 249650640.

The previous prime is 249650629. The next prime is 249650663. The reversal of 249650641 is 146056942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249166225 + 484416 = 15785^2 + 696^2 .

It is a cyclic number.

It is not a de Polignac number, because 249650641 - 2²⁷ = 115432913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249650641.

It is not a weakly prime, because it can be changed into another prime (249653641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124825320 + 124825321.

It is an arithmetic number, because the mean of its divisors is an integer number (124825321).

Almost surely, 2^249650641 is an apocalyptic number.

It is an amenable number.

249650641 is a deficient number, since it is larger than the sum of its proper divisors (1).

249650641 is an equidigital number, since it uses as much as digits as its factorization.

249650641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 249650641 is about 15800.3367369180. The cubic root of 249650641 is about 629.6669449798. Note that the first 3 decimals are identical.

The spelling of 249650641 in words is "two hundred forty-nine million, six hundred fifty thousand, six hundred forty-one".