81254761 has 8 divisors (see below), whose sum is σ = 93478784. Its totient is φ = 69184800.

The previous prime is 81254753. The next prime is 81254779. The reversal of 81254761 is 16745218.

81254761 = T₃₅₈ + T₃₅₉ + ... + T₈₁₀.

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

It is a cyclic number.

It is not a de Polignac number, because 81254761 - 2³ = 81254753 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (81254711) 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, 37380 + ... + 39493.

It is an arithmetic number, because the mean of its divisors is an integer number (11684848).

Almost surely, 2^81254761 is an apocalyptic number.

It is an amenable number.

81254761 is a deficient number, since it is larger than the sum of its proper divisors (12224023).

81254761 is a wasteful number, since it uses less digits than its factorization.

81254761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77031.

The product of its digits is 13440, while the sum is 34.

The square root of 81254761 is about 9014.1422775548. The cubic root of 81254761 is about 433.1280123296.

Adding to 81254761 its reverse (16745218), we get a palindrome (97999979).

The spelling of 81254761 in words is "eighty-one million, two hundred fifty-four thousand, seven hundred sixty-one".