1561337 has 2 divisors, whose sum is σ = 1561338. Its totient is φ = 1561336.

The previous prime is 1561303. The next prime is 1561349. The reversal of 1561337 is 7331651.

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., 1371241 + 190096 = 1171^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1561337 - 2¹⁰ = 1560313 is a prime.

It is a Chen prime.

It is equal to p₁₁₈₄₆₆ and since 1561337 and 118466 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1561367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780668 + 780669.

It is an arithmetic number, because the mean of its divisors is an integer number (780669).

2^1561337 is an apocalyptic number.

It is an amenable number.

1561337 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561337 is an equidigital number, since it uses as much as digits as its factorization.

1561337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 26.

The square root of 1561337 is about 1249.5347134034. The cubic root of 1561337 is about 116.0109234660.

Adding to 1561337 its reverse (7331651), we get a palindrome (8892988).

The spelling of 1561337 in words is "one million, five hundred sixty-one thousand, three hundred thirty-seven".