121165845461 has 2 divisors, whose sum is σ = 121165845462. Its totient is φ = 121165845460.

The previous prime is 121165845457. The next prime is 121165845467. The reversal of 121165845461 is 164548561121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99789651025 + 21376194436 = 315895^2 + 146206^2 .

It is a cyclic number.

It is not a de Polignac number, because 121165845461 - 2² = 121165845457 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121165845467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60582922730 + 60582922731.

It is an arithmetic number, because the mean of its divisors is an integer number (60582922731).

Almost surely, 2^121165845461 is an apocalyptic number.

It is an amenable number.

121165845461 is a deficient number, since it is larger than the sum of its proper divisors (1).

121165845461 is an equidigital number, since it uses as much as digits as its factorization.

121165845461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230400, while the sum is 44.

The spelling of 121165845461 in words is "one hundred twenty-one billion, one hundred sixty-five million, eight hundred forty-five thousand, four hundred sixty-one".