81120397948 has 6 divisors (see below), whose sum is σ = 141960696416. Its totient is φ = 40560198972.

The previous prime is 81120397889. The next prime is 81120397979. The reversal of 81120397948 is 84979302118.

It is a super-3 number, since 3×81120397948³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 81120397895 and 81120397904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10140049740 + ... + 10140049747.

Almost surely, 2^81120397948 is an apocalyptic number.

It is an amenable number.

81120397948 is a deficient number, since it is larger than the sum of its proper divisors (60840298468).

81120397948 is a wasteful number, since it uses less digits than its factorization.

81120397948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20280099491 (or 20280099489 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 81120397948 in words is "eighty-one billion, one hundred twenty million, three hundred ninety-seven thousand, nine hundred forty-eight".