147430781 has 2 divisors, whose sum is σ = 147430782. Its totient is φ = 147430780.

The previous prime is 147430771. The next prime is 147430807. The reversal of 147430781 is 187034741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91030681 + 56400100 = 9541^2 + 7510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-147430781 is a prime.

It is a super-2 number, since 2×147430781² = 43471670372539922, which contains 22 as substring.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147430741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73715390 + 73715391.

It is an arithmetic number, because the mean of its divisors is an integer number (73715391).

Almost surely, 2^147430781 is an apocalyptic number.

It is an amenable number.

147430781 is a deficient number, since it is larger than the sum of its proper divisors (1).

147430781 is an equidigital number, since it uses as much as digits as its factorization.

147430781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 147430781 is about 12142.1077659523. The cubic root of 147430781 is about 528.2782397237.

The spelling of 147430781 in words is "one hundred forty-seven million, four hundred thirty thousand, seven hundred eighty-one".