103181693149921 has 3 divisors (see below), whose sum is σ = 103181703307761. Its totient is φ = 103181682992082.

The previous prime is 103181693149919. The next prime is 103181693149967. The reversal of 103181693149921 is 129941396181301.

It is a happy number.

The square root of 103181693149921 is 10157839.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 103181693149921 - 2¹ = 103181693149919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103181693149991) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5078920 + ... + 15236758.

It is an arithmetic number, because the mean of its divisors is an integer number (34393901102587).

Almost surely, 2^{103181693149921} is an apocalyptic number.

103181693149921 is the 10157839-th square number.

103181693149921 is the 5078920-th centered octagonal number.

It is an amenable number.

103181693149921 is a deficient number, since it is larger than the sum of its proper divisors (10157840).

103181693149921 is an frugal number, since it uses more digits than its factorization.

103181693149921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20315678 (or 10157839 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 58.

The spelling of 103181693149921 in words is "one hundred three trillion, one hundred eighty-one billion, six hundred ninety-three million, one hundred forty-nine thousand, nine hundred twenty-one".