1535861 has 2 divisors, whose sum is σ = 1535862. Its totient is φ = 1535860.

The previous prime is 1535857. The next prime is 1535867. The reversal of 1535861 is 1685351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1380625 + 155236 = 1175^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 1535861 - 2² = 1535857 is a prime.

It is a super-2 number, since 2×1535861² = 4717738022642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1535867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 767930 + 767931.

It is an arithmetic number, because the mean of its divisors is an integer number (767931).

2^1535861 is an apocalyptic number.

It is an amenable number.

1535861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1535861 is an equidigital number, since it uses as much as digits as its factorization.

1535861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 1535861 is about 1239.2985919463. The cubic root of 1535861 is about 115.3764850909.

The spelling of 1535861 in words is "one million, five hundred thirty-five thousand, eight hundred sixty-one".