249489661 has 2 divisors, whose sum is σ = 249489662. Its totient is φ = 249489660.

The previous prime is 249489601. The next prime is 249489673. The reversal of 249489661 is 166984942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156000100 + 93489561 = 12490^2 + 9669^2 .

It is a cyclic number.

It is not a de Polignac number, because 249489661 - 2¹³ = 249481469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249489601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124744830 + 124744831.

It is an arithmetic number, because the mean of its divisors is an integer number (124744831).

Almost surely, 2^249489661 is an apocalyptic number.

It is an amenable number.

249489661 is a deficient number, since it is larger than the sum of its proper divisors (1).

249489661 is an equidigital number, since it uses as much as digits as its factorization.

249489661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 49.

The square root of 249489661 is about 15795.2417202144. The cubic root of 249489661 is about 629.5315750359.

The spelling of 249489661 in words is "two hundred forty-nine million, four hundred eighty-nine thousand, six hundred sixty-one".