81061465 has 8 divisors (see below), whose sum is σ = 97328448. Its totient is φ = 64812720.

The previous prime is 81061451. The next prime is 81061471. The reversal of 81061465 is 56416018.

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

It is a de Polignac number, because none of the positive numbers 2^k-81061465 is a prime.

It is a super-2 number, since 2×81061465² = 13141922215892450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8770 + ... + 15460.

It is an arithmetic number, because the mean of its divisors is an integer number (12166056).

Almost surely, 2^81061465 is an apocalyptic number.

It is an amenable number.

81061465 is a deficient number, since it is larger than the sum of its proper divisors (16266983).

81061465 is a wasteful number, since it uses less digits than its factorization.

81061465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9119.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 81061465 is about 9003.4140746719. The cubic root of 81061465 is about 432.7842852360.

The spelling of 81061465 in words is "eighty-one million, sixty-one thousand, four hundred sixty-five".