121737521 has 2 divisors, whose sum is σ = 121737522. Its totient is φ = 121737520.

The previous prime is 121737491. The next prime is 121737547. The reversal of 121737521 is 125737121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118810000 + 2927521 = 10900^2 + 1711^2 .

It is an emirp because it is prime and its reverse (125737121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121737521 - 2⁶ = 121737457 is a prime.

It is not a weakly prime, because it can be changed into another prime (121737571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60868760 + 60868761.

It is an arithmetic number, because the mean of its divisors is an integer number (60868761).

Almost surely, 2^121737521 is an apocalyptic number.

It is an amenable number.

121737521 is a deficient number, since it is larger than the sum of its proper divisors (1).

121737521 is an equidigital number, since it uses as much as digits as its factorization.

121737521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2940, while the sum is 29.

The square root of 121737521 is about 11033.4727533991. The cubic root of 121737521 is about 495.6116250107.

The spelling of 121737521 in words is "one hundred twenty-one million, seven hundred thirty-seven thousand, five hundred twenty-one".