81401949935 has 8 divisors (see below), whose sum is σ = 97689907440. Its totient is φ = 65116514944.

The previous prime is 81401949919. The next prime is 81401949971. The reversal of 81401949935 is 53994910418.

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 81401949935 - 2⁴ = 81401949919 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 558890 + ... + 689319.

It is an arithmetic number, because the mean of its divisors is an integer number (12211238430).

Almost surely, 2^81401949935 is an apocalyptic number.

81401949935 is a deficient number, since it is larger than the sum of its proper divisors (16287957505).

81401949935 is a wasteful number, since it uses less digits than its factorization.

81401949935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261257.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 81401949935 in words is "eighty-one billion, four hundred one million, nine hundred forty-nine thousand, nine hundred thirty-five".