147991087 has 2 divisors, whose sum is σ = 147991088. Its totient is φ = 147991086.

The previous prime is 147991043. The next prime is 147991127. The reversal of 147991087 is 780199741.

It is a strong prime.

It is an emirp because it is prime and its reverse (780199741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147991087 - 2⁷ = 147990959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147991187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73995543 + 73995544.

It is an arithmetic number, because the mean of its divisors is an integer number (73995544).

Almost surely, 2^147991087 is an apocalyptic number.

147991087 is a deficient number, since it is larger than the sum of its proper divisors (1).

147991087 is an equidigital number, since it uses as much as digits as its factorization.

147991087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 147991087 is about 12165.1587330376. The cubic root of 147991087 is about 528.9466285969.

The spelling of 147991087 in words is "one hundred forty-seven million, nine hundred ninety-one thousand, eighty-seven".