81413747 has 2 divisors, whose sum is σ = 81413748. Its totient is φ = 81413746.

The previous prime is 81413743. The next prime is 81413789. The reversal of 81413747 is 74731418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81413747 - 2² = 81413743 is a prime.

It is not a weakly prime, because it can be changed into another prime (81413743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40706873 + 40706874.

It is an arithmetic number, because the mean of its divisors is an integer number (40706874).

Almost surely, 2^81413747 is an apocalyptic number.

81413747 is a deficient number, since it is larger than the sum of its proper divisors (1).

81413747 is an equidigital number, since it uses as much as digits as its factorization.

81413747 is an evil number, because the sum of its binary digits is even.

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

The square root of 81413747 is about 9022.9566661932. The cubic root of 81413747 is about 433.4103195894.

The spelling of 81413747 in words is "eighty-one million, four hundred thirteen thousand, seven hundred forty-seven".