121500761 has 2 divisors, whose sum is σ = 121500762. Its totient is φ = 121500760.

The previous prime is 121500733. The next prime is 121500767. The reversal of 121500761 is 167005121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84290761 + 37210000 = 9181^2 + 6100^2 .

It is an emirp because it is prime and its reverse (167005121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121500761 - 2²² = 117306457 is a prime.

It is not a weakly prime, because it can be changed into another prime (121500767) 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, 60750380 + 60750381.

It is an arithmetic number, because the mean of its divisors is an integer number (60750381).

Almost surely, 2^121500761 is an apocalyptic number.

It is an amenable number.

121500761 is a deficient number, since it is larger than the sum of its proper divisors (1).

121500761 is an equidigital number, since it uses as much as digits as its factorization.

121500761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 121500761 is about 11022.7383621313. The cubic root of 121500761 is about 495.2901213924.

Adding to 121500761 its reverse (167005121), we get a palindrome (288505882).

The spelling of 121500761 in words is "one hundred twenty-one million, five hundred thousand, seven hundred sixty-one".