1550491 has 4 divisors (see below), whose sum is σ = 1552984. Its totient is φ = 1548000.

The previous prime is 1550477. The next prime is 1550503. The reversal of 1550491 is 1940551.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1550491 - 2⁷ = 1550363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1550401) 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, 556 + ... + 1846.

It is an arithmetic number, because the mean of its divisors is an integer number (388246).

2^1550491 is an apocalyptic number.

1550491 is a deficient number, since it is larger than the sum of its proper divisors (2493).

1550491 is a wasteful number, since it uses less digits than its factorization.

1550491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1550491 is about 1245.1871345304. The cubic root of 1550491 is about 115.7416714709.

The spelling of 1550491 in words is "one million, five hundred fifty thousand, four hundred ninety-one".