121997437 has 2 divisors, whose sum is σ = 121997438. Its totient is φ = 121997436.

The previous prime is 121997417. The next prime is 121997443. The reversal of 121997437 is 734799121.

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., 116337796 + 5659641 = 10786^2 + 2379^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121997437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121997393 and 121997402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121997417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60998718 + 60998719.

It is an arithmetic number, because the mean of its divisors is an integer number (60998719).

Almost surely, 2^121997437 is an apocalyptic number.

It is an amenable number.

121997437 is a deficient number, since it is larger than the sum of its proper divisors (1).

121997437 is an equidigital number, since it uses as much as digits as its factorization.

121997437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 121997437 is about 11045.2449950193. The cubic root of 121997437 is about 495.9640932318.

The spelling of 121997437 in words is "one hundred twenty-one million, nine hundred ninety-seven thousand, four hundred thirty-seven".