81373465 has 8 divisors (see below), whose sum is σ = 98986248. Its totient is φ = 64206720.

The previous prime is 81373463. The next prime is 81373469. The reversal of 81373465 is 56437318.

It can be written as a sum of positive squares in 4 ways, for example, as 13162384 + 68211081 = 3628^2 + 8259^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81373465 - 2¹ = 81373463 is a prime.

It is a super-2 number, since 2×81373465² = 13243281612212450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81373463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111106 + ... + 111835.

It is an arithmetic number, because the mean of its divisors is an integer number (12373281).

Almost surely, 2^81373465 is an apocalyptic number.

It is an amenable number.

81373465 is a deficient number, since it is larger than the sum of its proper divisors (17612783).

81373465 is a wasteful number, since it uses less digits than its factorization.

81373465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223019.

The product of its digits is 60480, while the sum is 37.

The square root of 81373465 is about 9020.7241948748. The cubic root of 81373465 is about 433.3388266891.

The spelling of 81373465 in words is "eighty-one million, three hundred seventy-three thousand, four hundred sixty-five".