3787561 has 2 divisors, whose sum is σ = 3787562. Its totient is φ = 3787560.

The previous prime is 3787547. The next prime is 3787591. The reversal of 3787561 is 1657873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2621161 + 1166400 = 1619^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 3787561 - 2⁵ = 3787529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3787561.

It is not a weakly prime, because it can be changed into another prime (3787501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1893780 + 1893781.

It is an arithmetic number, because the mean of its divisors is an integer number (1893781).

Almost surely, 2^3787561 is an apocalyptic number.

It is an amenable number.

3787561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3787561 is an equidigital number, since it uses as much as digits as its factorization.

3787561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 3787561 is about 1946.1657175071. The cubic root of 3787561 is about 155.8786174996.

The spelling of 3787561 in words is "three million, seven hundred eighty-seven thousand, five hundred sixty-one".