1491971 has 16 divisors (see below), whose sum is σ = 1751904. Its totient is φ = 1257984.

The previous prime is 1491967. The next prime is 1491977. The reversal of 1491971 is 1791941.

It is a happy number.

It is not a de Polignac number, because 1491971 - 2² = 1491967 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9425 + ... + 9581.

It is an arithmetic number, because the mean of its divisors is an integer number (109494).

2^1491971 is an apocalyptic number.

1491971 is a deficient number, since it is larger than the sum of its proper divisors (259933).

1491971 is a wasteful number, since it uses less digits than its factorization.

1491971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230.

The product of its digits is 2268, while the sum is 32.

The square root of 1491971 is about 1221.4626478120. The cubic root of 1491971 is about 114.2668162949.

The spelling of 1491971 in words is "one million, four hundred ninety-one thousand, nine hundred seventy-one".