1625561 has 8 divisors (see below), whose sum is σ = 1869504. Its totient is φ = 1384560.

The previous prime is 1625551. The next prime is 1625573. The reversal of 1625561 is 1655261.

1625561 = T₆₇₈ + T₆₇₉ + ... + T₆₈₄.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1625561 - 2⁶ = 1625497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1625561.

It is not an unprimeable number, because it can be changed into a prime (1625501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 626 + ... + 1908.

It is an arithmetic number, because the mean of its divisors is an integer number (233688).

2^1625561 is an apocalyptic number.

It is an amenable number.

1625561 is a deficient number, since it is larger than the sum of its proper divisors (243943).

1625561 is a wasteful number, since it uses less digits than its factorization.

1625561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471.

The product of its digits is 1800, while the sum is 26.

The square root of 1625561 is about 1274.9749017138. The cubic root of 1625561 is about 117.5802620475.

The spelling of 1625561 in words is "one million, six hundred twenty-five thousand, five hundred sixty-one".