81361495 has 8 divisors (see below), whose sum is σ = 99234720. Its totient is φ = 64021920.

The previous prime is 81361487. The next prime is 81361499. The reversal of 81361495 is 59416318.

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

It is not a de Polignac number, because 81361495 - 2³ = 81361487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81361499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133075 + ... + 133684.

It is an arithmetic number, because the mean of its divisors is an integer number (12404340).

Almost surely, 2^81361495 is an apocalyptic number.

81361495 is a deficient number, since it is larger than the sum of its proper divisors (17873225).

81361495 is a wasteful number, since it uses less digits than its factorization.

81361495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266825.

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

The square root of 81361495 is about 9020.0606982437. The cubic root of 81361495 is about 433.3175776651.

The spelling of 81361495 in words is "eighty-one million, three hundred sixty-one thousand, four hundred ninety-five".