81260659 has 2 divisors, whose sum is σ = 81260660. Its totient is φ = 81260658.

The previous prime is 81260657. The next prime is 81260671. The reversal of 81260659 is 95606218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81260659 - 2¹ = 81260657 is a prime.

It is a super-2 number, since 2×81260659² = 13206589402228562, which contains 22 as substring.

Together with 81260657, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81260657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40630329 + 40630330.

It is an arithmetic number, because the mean of its divisors is an integer number (40630330).

Almost surely, 2^81260659 is an apocalyptic number.

81260659 is a deficient number, since it is larger than the sum of its proper divisors (1).

81260659 is an equidigital number, since it uses as much as digits as its factorization.

81260659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 81260659 is about 9014.4694242091. The cubic root of 81260659 is about 433.1384918272.

The spelling of 81260659 in words is "eighty-one million, two hundred sixty thousand, six hundred fifty-nine".