81258265 has 16 divisors (see below), whose sum is σ = 106551936. Its totient is φ = 58998400.

The previous prime is 81258263. The next prime is 81258277. The reversal of 81258265 is 56285218.

It is not a de Polignac number, because 81258265 - 2¹ = 81258263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81258263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55989 + ... + 57421.

It is an arithmetic number, because the mean of its divisors is an integer number (6659496).

Almost surely, 2^81258265 is an apocalyptic number.

It is an amenable number.

81258265 is a deficient number, since it is larger than the sum of its proper divisors (25293671).

81258265 is a wasteful number, since it uses less digits than its factorization.

81258265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480.

The product of its digits is 38400, while the sum is 37.

The square root of 81258265 is about 9014.3366367138. The cubic root of 81258265 is about 433.1342382570.

The spelling of 81258265 in words is "eighty-one million, two hundred fifty-eight thousand, two hundred sixty-five".