147426451981 has 2 divisors, whose sum is σ = 147426451982. Its totient is φ = 147426451980.

The previous prime is 147426451973. The next prime is 147426452003. The reversal of 147426451981 is 189154624741.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123204510025 + 24221941956 = 351005^2 + 155634^2 .

It is a cyclic number.

It is not a de Polignac number, because 147426451981 - 2³ = 147426451973 is a prime.

It is a super-4 number, since 4×147426451981⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147426451181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73713225990 + 73713225991.

It is an arithmetic number, because the mean of its divisors is an integer number (73713225991).

Almost surely, 2^147426451981 is an apocalyptic number.

It is an amenable number.

147426451981 is a deficient number, since it is larger than the sum of its proper divisors (1).

147426451981 is an equidigital number, since it uses as much as digits as its factorization.

147426451981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 52.

The spelling of 147426451981 in words is "one hundred forty-seven billion, four hundred twenty-six million, four hundred fifty-one thousand, nine hundred eighty-one".