121513237 has 2 divisors, whose sum is σ = 121513238. Its totient is φ = 121513236.

The previous prime is 121513193. The next prime is 121513247. The reversal of 121513237 is 732315121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83887281 + 37625956 = 9159^2 + 6134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121513237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121513247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60756618 + 60756619.

It is an arithmetic number, because the mean of its divisors is an integer number (60756619).

Almost surely, 2^121513237 is an apocalyptic number.

It is an amenable number.

121513237 is a deficient number, since it is larger than the sum of its proper divisors (1).

121513237 is an equidigital number, since it uses as much as digits as its factorization.

121513237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 25.

The square root of 121513237 is about 11023.3042686846. The cubic root of 121513237 is about 495.3070733522.

Adding to 121513237 its reverse (732315121), we get a palindrome (853828358).

The spelling of 121513237 in words is "one hundred twenty-one million, five hundred thirteen thousand, two hundred thirty-seven".