1540561 has 8 divisors (see below), whose sum is σ = 1720224. Its totient is φ = 1367520.

The previous prime is 1540559. The next prime is 1540573. The reversal of 1540561 is 1650451.

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

It is not a de Polignac number, because 1540561 - 2¹ = 1540559 is a prime.

1540561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1540541) 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, 1156 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (215028).

2^1540561 is an apocalyptic number.

1540561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1540561 is a deficient number, since it is larger than the sum of its proper divisors (179663).

1540561 is a wasteful number, since it uses less digits than its factorization.

1540561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1540561 is about 1241.1933773591. The cubic root of 1540561 is about 115.4940559024.

The spelling of 1540561 in words is "one million, five hundred forty thousand, five hundred sixty-one".