81262465 has 12 divisors (see below), whose sum is σ = 103590396. Its totient is φ = 61184768.

The previous prime is 81262463. The next prime is 81262477. The reversal of 81262465 is 56426218.

It can be written as a sum of positive squares in 6 ways, for example, as 4822416 + 76440049 = 2196^2 + 8743^2 .

It is not a de Polignac number, because 81262465 - 2¹ = 81262463 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81262465.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81262463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26674 + ... + 29563.

It is an arithmetic number, because the mean of its divisors is an integer number (8632533).

Almost surely, 2^81262465 is an apocalyptic number.

81262465 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

81262465 is a deficient number, since it is larger than the sum of its proper divisors (22327931).

81262465 is a wasteful number, since it uses less digits than its factorization.

81262465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56276 (or 56259 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 81262465 is about 9014.5695959375. The cubic root of 81262465 is about 433.1417006055.

The spelling of 81262465 in words is "eighty-one million, two hundred sixty-two thousand, four hundred sixty-five".