247990949 has 2 divisors, whose sum is σ = 247990950. Its totient is φ = 247990948.

The previous prime is 247990931. The next prime is 247990997. The reversal of 247990949 is 949099742.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165508225 + 82482724 = 12865^2 + 9082^2 .

It is a cyclic number.

It is not a de Polignac number, because 247990949 - 2⁸ = 247990693 is a prime.

It is a super-2 number, since 2×247990949² = 122999021571841202, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 247990949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247990999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123995474 + 123995475.

It is an arithmetic number, because the mean of its divisors is an integer number (123995475).

Almost surely, 2^247990949 is an apocalyptic number.

It is an amenable number.

247990949 is a deficient number, since it is larger than the sum of its proper divisors (1).

247990949 is an equidigital number, since it uses as much as digits as its factorization.

247990949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 247990949 is about 15747.7283758642. The cubic root of 247990949 is about 628.2684872035.

The spelling of 247990949 in words is "two hundred forty-seven million, nine hundred ninety thousand, nine hundred forty-nine".