81725354 has 4 divisors (see below), whose sum is σ = 122588034. Its totient is φ = 40862676.

The previous prime is 81725353. The next prime is 81725359. The reversal of 81725354 is 45352718.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45352718 = 2 ⋅22676359.

It can be written as a sum of positive squares in only one way, i.e., 58905625 + 22819729 = 7675^2 + 4777^2 .

It is not an unprimeable number, because it can be changed into a prime (81725351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20431337 + ... + 20431340.

Almost surely, 2^81725354 is an apocalyptic number.

81725354 is a deficient number, since it is larger than the sum of its proper divisors (40862680).

81725354 is a wasteful number, since it uses less digits than its factorization.

81725354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40862679.

The product of its digits is 33600, while the sum is 35.

The square root of 81725354 is about 9040.2076303589. The cubic root of 81725354 is about 433.9625676480.

The spelling of 81725354 in words is "eighty-one million, seven hundred twenty-five thousand, three hundred fifty-four".