1537997 has 2 divisors, whose sum is σ = 1537998. Its totient is φ = 1537996.

The previous prime is 1537969. The next prime is 1537999. The reversal of 1537997 is 7997351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1510441 + 27556 = 1229^2 + 166^2 .

It is an emirp because it is prime and its reverse (7997351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1537997 - 2⁶ = 1537933 is a prime.

Together with 1537999, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1537999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 768998 + 768999.

It is an arithmetic number, because the mean of its divisors is an integer number (768999).

2^1537997 is an apocalyptic number.

It is an amenable number.

1537997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1537997 is an equidigital number, since it uses as much as digits as its factorization.

1537997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59535, while the sum is 41.

The square root of 1537997 is about 1240.1600703135. The cubic root of 1537997 is about 115.4299469630.

The spelling of 1537997 in words is "one million, five hundred thirty-seven thousand, nine hundred ninety-seven".