249947669 has 2 divisors, whose sum is σ = 249947670. Its totient is φ = 249947668.

The previous prime is 249947653. The next prime is 249947681. The reversal of 249947669 is 966749942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212284900 + 37662769 = 14570^2 + 6137^2 .

It is a cyclic number.

It is not a de Polignac number, because 249947669 - 2⁴ = 249947653 is a prime.

It is a super-2 number, since 2×249947669² = 124947674477067122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249947639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124973834 + 124973835.

It is an arithmetic number, because the mean of its divisors is an integer number (124973835).

Almost surely, 2^249947669 is an apocalyptic number.

It is an amenable number.

249947669 is a deficient number, since it is larger than the sum of its proper divisors (1).

249947669 is an equidigital number, since it uses as much as digits as its factorization.

249947669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 56.

The square root of 249947669 is about 15809.7333627105. The cubic root of 249947669 is about 629.9165665945.

The spelling of 249947669 in words is "two hundred forty-nine million, nine hundred forty-seven thousand, six hundred sixty-nine".