247190981 has 2 divisors, whose sum is σ = 247190982. Its totient is φ = 247190980.

The previous prime is 247190929. The next prime is 247190987. The reversal of 247190981 is 189091742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191822500 + 55368481 = 13850^2 + 7441^2 .

It is a cyclic number.

It is not a de Polignac number, because 247190981 - 2⁶ = 247190917 is a prime.

It is a super-2 number, since 2×247190981² = 122206762175484722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247190987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123595490 + 123595491.

It is an arithmetic number, because the mean of its divisors is an integer number (123595491).

Almost surely, 2^247190981 is an apocalyptic number.

It is an amenable number.

247190981 is a deficient number, since it is larger than the sum of its proper divisors (1).

247190981 is an equidigital number, since it uses as much as digits as its factorization.

247190981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 247190981 is about 15722.3083864934. The cubic root of 247190981 is about 627.5922043522.

The spelling of 247190981 in words is "two hundred forty-seven million, one hundred ninety thousand, nine hundred eighty-one".