1491161 has 4 divisors (see below), whose sum is σ = 1704192. Its totient is φ = 1278132.

The previous prime is 1491157. The next prime is 1491179. The reversal of 1491161 is 1611941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1491161 - 2² = 1491157 is a prime.

It is a super-2 number, since 2×1491161² = 4447122255842, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1491661) 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, 106505 + ... + 106518.

It is an arithmetic number, because the mean of its divisors is an integer number (426048).

2^1491161 is an apocalyptic number.

It is an amenable number.

1491161 is a deficient number, since it is larger than the sum of its proper divisors (213031).

1491161 is an equidigital number, since it uses as much as digits as its factorization.

1491161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213030.

The product of its digits is 216, while the sum is 23.

The square root of 1491161 is about 1221.1310331001. The cubic root of 1491161 is about 114.2461338384.

The spelling of 1491161 in words is "one million, four hundred ninety-one thousand, one hundred sixty-one".