1537561 has 2 divisors, whose sum is σ = 1537562. Its totient is φ = 1537560.

The previous prime is 1537559. The next prime is 1537607. The reversal of 1537561 is 1657351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1392400 + 145161 = 1180^2 + 381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1537561 - 2¹ = 1537559 is a prime.

Together with 1537559, it forms a pair of twin primes.

It is a Chen prime.

1537561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1537061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 768780 + 768781.

It is an arithmetic number, because the mean of its divisors is an integer number (768781).

2^1537561 is an apocalyptic number.

It is an amenable number.

1537561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1537561 is an equidigital number, since it uses as much as digits as its factorization.

1537561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3150, while the sum is 28.

The square root of 1537561 is about 1239.9842740938. The cubic root of 1537561 is about 115.4190383563.

The spelling of 1537561 in words is "one million, five hundred thirty-seven thousand, five hundred sixty-one".