147857861 has 2 divisors, whose sum is σ = 147857862. Its totient is φ = 147857860.

The previous prime is 147857837. The next prime is 147857887. The reversal of 147857861 is 168758741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134212225 + 13645636 = 11585^2 + 3694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-147857861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147857821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73928930 + 73928931.

It is an arithmetic number, because the mean of its divisors is an integer number (73928931).

Almost surely, 2^147857861 is an apocalyptic number.

It is an amenable number.

147857861 is a deficient number, since it is larger than the sum of its proper divisors (1).

147857861 is an equidigital number, since it uses as much as digits as its factorization.

147857861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 47.

The square root of 147857861 is about 12159.6817803757. The cubic root of 147857861 is about 528.7878564218.

The spelling of 147857861 in words is "one hundred forty-seven million, eight hundred fifty-seven thousand, eight hundred sixty-one".