81254707929231 has 8 divisors (see below), whose sum is σ = 108339735598464. Its totient is φ = 54169742773080.

The previous prime is 81254707929173. The next prime is 81254707929271. The reversal of 81254707929231 is 13292970745218.

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

It is not a de Polignac number, because 81254707929231 - 2³¹ = 81252560445583 is a prime.

It is a super-2 number, since 2×81254707929231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81254707929271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12506301 + ... + 17858246.

It is an arithmetic number, because the mean of its divisors is an integer number (13542466949808).

Almost surely, 2^{81254707929231} is an apocalyptic number.

81254707929231 is a deficient number, since it is larger than the sum of its proper divisors (27085027669233).

81254707929231 is a wasteful number, since it uses less digits than its factorization.

81254707929231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31256541.

The product of its (nonzero) digits is 15240960, while the sum is 60.

The spelling of 81254707929231 in words is "eighty-one trillion, two hundred fifty-four billion, seven hundred seven million, nine hundred twenty-nine thousand, two hundred thirty-one".