1553491 has 4 divisors (see below), whose sum is σ = 1586592. Its totient is φ = 1520392.

The previous prime is 1553479. The next prime is 1553507. The reversal of 1553491 is 1943551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1553491 - 2¹⁵ = 1520723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553401) 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, 16480 + ... + 16573.

It is an arithmetic number, because the mean of its divisors is an integer number (396648).

2^1553491 is an apocalyptic number.

1553491 is a deficient number, since it is larger than the sum of its proper divisors (33101).

1553491 is an equidigital number, since it uses as much as digits as its factorization.

1553491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33100.

The product of its digits is 2700, while the sum is 28.

The square root of 1553491 is about 1246.3911905979. The cubic root of 1553491 is about 115.8162717770.

It can be divided in two parts, 15534 and 91, that added together give a 6-th power (15625 = 5⁶).

The spelling of 1553491 in words is "one million, five hundred fifty-three thousand, four hundred ninety-one".