1915561 has 8 divisors (see below), whose sum is σ = 2066400. Its totient is φ = 1769760.

The previous prime is 1915531. The next prime is 1915567. The reversal of 1915561 is 1655191.

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 1915561 - 2¹³ = 1907369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1915567) 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, 451 + ... + 2008.

It is an arithmetic number, because the mean of its divisors is an integer number (258300).

2^1915561 is an apocalyptic number.

It is an amenable number.

1915561 is a deficient number, since it is larger than the sum of its proper divisors (150839).

1915561 is a wasteful number, since it uses less digits than its factorization.

1915561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519.

The product of its digits is 1350, while the sum is 28.

The square root of 1915561 is about 1384.0379330062. The cubic root of 1915561 is about 124.1934415681.

The spelling of 1915561 in words is "one million, nine hundred fifteen thousand, five hundred sixty-one".