1606531 has 4 divisors (see below), whose sum is σ = 1612072. Its totient is φ = 1600992.

The previous prime is 1606529. The next prime is 1606537. The reversal of 1606531 is 1356061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1356061 = 7 ⋅193723.

It is a cyclic number.

It is not a de Polignac number, because 1606531 - 2¹ = 1606529 is a prime.

It is a super-2 number, since 2×1606531² = 5161883707922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1606537) 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, 2310 + ... + 2923.

It is an arithmetic number, because the mean of its divisors is an integer number (403018).

2^1606531 is an apocalyptic number.

1606531 is a deficient number, since it is larger than the sum of its proper divisors (5541).

1606531 is an equidigital number, since it uses as much as digits as its factorization.

1606531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5540.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1606531 is about 1267.4900394086. The cubic root of 1606531 is about 117.1196331542.

The spelling of 1606531 in words is "one million, six hundred six thousand, five hundred thirty-one".