81677341 has 2 divisors, whose sum is σ = 81677342. Its totient is φ = 81677340.

The previous prime is 81677329. The next prime is 81677377. The reversal of 81677341 is 14377618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50552100 + 31125241 = 7110^2 + 5579^2 .

It is a cyclic number.

It is not a de Polignac number, because 81677341 - 2⁷ = 81677213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81677341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81677041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40838670 + 40838671.

It is an arithmetic number, because the mean of its divisors is an integer number (40838671).

Almost surely, 2^81677341 is an apocalyptic number.

It is an amenable number.

81677341 is a deficient number, since it is larger than the sum of its proper divisors (1).

81677341 is an equidigital number, since it uses as much as digits as its factorization.

81677341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 81677341 is about 9037.5517149281. The cubic root of 81677341 is about 433.8775678066.

The spelling of 81677341 in words is "eighty-one million, six hundred seventy-seven thousand, three hundred forty-one".