121765404601 has 3 divisors (see below), whose sum is σ = 121765753551. Its totient is φ = 121765055652.

The previous prime is 121765404581. The next prime is 121765404613. The reversal of 121765404601 is 106404567121.

The square root of 121765404601 is 348949.

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 can be written as a sum of positive squares in only one way, i.e., 112560921001 + 9204483600 = 335501^2 + 95940^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121765404601 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121765404661) 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, 174475 + ... + 523423.

It is an arithmetic number, because the mean of its divisors is an integer number (40588584517).

Almost surely, 2^121765404601 is an apocalyptic number.

121765404601 is the 348949-th square number.

121765404601 is the 174475-th centered octagonal number.

It is an amenable number.

121765404601 is a deficient number, since it is larger than the sum of its proper divisors (348950).

121765404601 is an frugal number, since it uses more digits than its factorization.

121765404601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697898 (or 348949 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 121765404601 in words is "one hundred twenty-one billion, seven hundred sixty-five million, four hundred four thousand, six hundred one".