247145491 has 2 divisors, whose sum is σ = 247145492. Its totient is φ = 247145490.

The previous prime is 247145461. The next prime is 247145527. The reversal of 247145491 is 194541742.

247145491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247145491 - 2⁹ = 247144979 is a prime.

It is a super-2 number, since 2×247145491² = 122161787443262162, 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 247145491.

It is not a weakly prime, because it can be changed into another prime (247145441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123572745 + 123572746.

It is an arithmetic number, because the mean of its divisors is an integer number (123572746).

Almost surely, 2^247145491 is an apocalyptic number.

247145491 is a deficient number, since it is larger than the sum of its proper divisors (1).

247145491 is an equidigital number, since it uses as much as digits as its factorization.

247145491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 247145491 is about 15720.8616494135. The cubic root of 247145491 is about 627.5537038633.

The spelling of 247145491 in words is "two hundred forty-seven million, one hundred forty-five thousand, four hundred ninety-one".