1613971 has 4 divisors (see below), whose sum is σ = 1618672. Its totient is φ = 1609272.

The previous prime is 1613959. The next prime is 1613981. The reversal of 1613971 is 1793161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1613971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1613921) 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, 1791 + ... + 2536.

It is an arithmetic number, because the mean of its divisors is an integer number (404668).

2^1613971 is an apocalyptic number.

1613971 is a deficient number, since it is larger than the sum of its proper divisors (4701).

1613971 is an equidigital number, since it uses as much as digits as its factorization.

1613971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700.

The product of its digits is 1134, while the sum is 28.

The square root of 1613971 is about 1270.4215835698. The cubic root of 1613971 is about 117.3001522121.

The spelling of 1613971 in words is "one million, six hundred thirteen thousand, nine hundred seventy-one".