147881561 has 2 divisors, whose sum is σ = 147881562. Its totient is φ = 147881560.

The previous prime is 147881543. The next prime is 147881603. The reversal of 147881561 is 165188741.

147881561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78659161 + 69222400 = 8869^2 + 8320^2 .

It is an emirp because it is prime and its reverse (165188741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147881561 - 2²⁶ = 80772697 is a prime.

It is not a weakly prime, because it can be changed into another prime (147881761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73940780 + 73940781.

It is an arithmetic number, because the mean of its divisors is an integer number (73940781).

Almost surely, 2^147881561 is an apocalyptic number.

It is an amenable number.

147881561 is a deficient number, since it is larger than the sum of its proper divisors (1).

147881561 is an equidigital number, since it uses as much as digits as its factorization.

147881561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 41.

The square root of 147881561 is about 12160.6562734089. The cubic root of 147881561 is about 528.8161078848.

The spelling of 147881561 in words is "one hundred forty-seven million, eight hundred eighty-one thousand, five hundred sixty-one".