947412581 has 2 divisors, whose sum is σ = 947412582. Its totient is φ = 947412580.

The previous prime is 947412553. The next prime is 947412671. The reversal of 947412581 is 185214749.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 697488100 + 249924481 = 26410^2 + 15809^2 .

It is a cyclic number.

It is not a de Polignac number, because 947412581 - 2⁶ = 947412517 is a prime.

It is a super-2 number, since 2×947412581² = 1795181197274163122, which contains 22 as substring.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (947412541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473706290 + 473706291.

It is an arithmetic number, because the mean of its divisors is an integer number (473706291).

Almost surely, 2^947412581 is an apocalyptic number.

It is an amenable number.

947412581 is a deficient number, since it is larger than the sum of its proper divisors (1).

947412581 is an equidigital number, since it uses as much as digits as its factorization.

947412581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 41.

The square root of 947412581 is about 30780.0679174040. The cubic root of 947412581 is about 982.1542852368.

The spelling of 947412581 in words is "nine hundred forty-seven million, four hundred twelve thousand, five hundred eighty-one".