997381237 has 2 divisors, whose sum is σ = 997381238. Its totient is φ = 997381236.

The previous prime is 997381201. The next prime is 997381243. The reversal of 997381237 is 732183799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996917476 + 463761 = 31574^2 + 681^2 .

It is an emirp because it is prime and its reverse (732183799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997381237 - 2¹¹ = 997379189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997381247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498690618 + 498690619.

It is an arithmetic number, because the mean of its divisors is an integer number (498690619).

Almost surely, 2^997381237 is an apocalyptic number.

It is an amenable number.

997381237 is a deficient number, since it is larger than the sum of its proper divisors (1).

997381237 is an equidigital number, since it uses as much as digits as its factorization.

997381237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 49.

The square root of 997381237 is about 31581.3431791620. The cubic root of 997381237 is about 999.1263158984.

The spelling of 997381237 in words is "nine hundred ninety-seven million, three hundred eighty-one thousand, two hundred thirty-seven".