147481991 has 2 divisors, whose sum is σ = 147481992. Its totient is φ = 147481990.

The previous prime is 147481979. The next prime is 147481993. The reversal of 147481991 is 199184741.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 147481991 - 2¹⁴ = 147465607 is a prime.

Together with 147481993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147481993) 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, 73740995 + 73740996.

It is an arithmetic number, because the mean of its divisors is an integer number (73740996).

Almost surely, 2^147481991 is an apocalyptic number.

147481991 is a deficient number, since it is larger than the sum of its proper divisors (1).

147481991 is an equidigital number, since it uses as much as digits as its factorization.

147481991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 147481991 is about 12144.2163600621. The cubic root of 147481991 is about 528.3393983609.

The spelling of 147481991 in words is "one hundred forty-seven million, four hundred eighty-one thousand, nine hundred ninety-one".