3756561 has 4 divisors (see below), whose sum is σ = 5008752. Its totient is φ = 2504372.

The previous prime is 3756559. The next prime is 3756581. The reversal of 3756561 is 1656573.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3756561 - 2¹ = 3756559 is a prime.

It is a super-2 number, since 2×3756561² = 28223501093442, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3756551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626091 + ... + 626096.

It is an arithmetic number, because the mean of its divisors is an integer number (1252188).

Almost surely, 2^3756561 is an apocalyptic number.

It is an amenable number.

3756561 is a deficient number, since it is larger than the sum of its proper divisors (1252191).

3756561 is a wasteful number, since it uses less digits than its factorization.

3756561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252190.

The product of its digits is 18900, while the sum is 33.

The square root of 3756561 is about 1938.1849756925. The cubic root of 3756561 is about 155.4521794069.

It can be divided in two parts, 375 and 6561, that multiplied together give a cube (2460375 = 135³).

The spelling of 3756561 in words is "three million, seven hundred fifty-six thousand, five hundred sixty-one".