121331437 has 2 divisors, whose sum is σ = 121331438. Its totient is φ = 121331436.

The previous prime is 121331429. The next prime is 121331443. The reversal of 121331437 is 734133121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117744201 + 3587236 = 10851^2 + 1894^2 .

It is an emirp because it is prime and its reverse (734133121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121331437 - 2³ = 121331429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121331407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60665718 + 60665719.

It is an arithmetic number, because the mean of its divisors is an integer number (60665719).

Almost surely, 2^121331437 is an apocalyptic number.

It is an amenable number.

121331437 is a deficient number, since it is larger than the sum of its proper divisors (1).

121331437 is an equidigital number, since it uses as much as digits as its factorization.

121331437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 121331437 is about 11015.0550157500. The cubic root of 121331437 is about 495.0599349255.

Adding to 121331437 its reverse (734133121), we get a palindrome (855464558).

The spelling of 121331437 in words is "one hundred twenty-one million, three hundred thirty-one thousand, four hundred thirty-seven".