147481993 has 2 divisors, whose sum is σ = 147481994. Its totient is φ = 147481992.

The previous prime is 147481991. The next prime is 147482017. The reversal of 147481993 is 399184741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140256649 + 7225344 = 11843^2 + 2688^2 .

It is an emirp because it is prime and its reverse (399184741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147481993 - 2¹ = 147481991 is a prime.

Together with 147481991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (147481991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73740996 + 73740997.

It is an arithmetic number, because the mean of its divisors is an integer number (73740997).

Almost surely, 2^147481993 is an apocalyptic number.

It is an amenable number.

147481993 is a deficient number, since it is larger than the sum of its proper divisors (1).

147481993 is an equidigital number, since it uses as much as digits as its factorization.

147481993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 147481993 is about 12144.2164424058. The cubic root of 147481993 is about 528.3394007492.

The spelling of 147481993 in words is "one hundred forty-seven million, four hundred eighty-one thousand, nine hundred ninety-three".