247478890987 has 2 divisors, whose sum is σ = 247478890988. Its totient is φ = 247478890986.

The previous prime is 247478890943. The next prime is 247478891057. The reversal of 247478890987 is 789098874742.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247478890987 - 2²³ = 247470502379 is a prime.

It is a super-2 number, since 2×247478890987² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247478890187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123739445493 + 123739445494.

It is an arithmetic number, because the mean of its divisors is an integer number (123739445494).

Almost surely, 2^247478890987 is an apocalyptic number.

247478890987 is a deficient number, since it is larger than the sum of its proper divisors (1).

247478890987 is an equidigital number, since it uses as much as digits as its factorization.

247478890987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 455196672, while the sum is 73.

The spelling of 247478890987 in words is "two hundred forty-seven billion, four hundred seventy-eight million, eight hundred ninety thousand, nine hundred eighty-seven".