81732452541 has 4 divisors (see below), whose sum is σ = 108976603392. Its totient is φ = 54488301692.

The previous prime is 81732452479. The next prime is 81732452561. The reversal of 81732452541 is 14525423718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81732452541 - 2⁹ = 81732452029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81732452493 and 81732452502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81732452561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13622075421 + ... + 13622075426.

It is an arithmetic number, because the mean of its divisors is an integer number (27244150848).

Almost surely, 2^81732452541 is an apocalyptic number.

It is an amenable number.

81732452541 is a deficient number, since it is larger than the sum of its proper divisors (27244150851).

81732452541 is a wasteful number, since it uses less digits than its factorization.

81732452541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27244150850.

The product of its digits is 268800, while the sum is 42.

The spelling of 81732452541 in words is "eighty-one billion, seven hundred thirty-two million, four hundred fifty-two thousand, five hundred forty-one".