1670491 has 2 divisors, whose sum is σ = 1670492. Its totient is φ = 1670490.

The previous prime is 1670489. The next prime is 1670503. The reversal of 1670491 is 1940761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1670491 - 2¹ = 1670489 is a prime.

Together with 1670489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1670411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835245 + 835246.

It is an arithmetic number, because the mean of its divisors is an integer number (835246).

2^1670491 is an apocalyptic number.

1670491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670491 is an equidigital number, since it uses as much as digits as its factorization.

1670491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1670491 is about 1292.4747579740. The cubic root of 1670491 is about 118.6537258469.

It can be divided in two parts, 16 and 70491, that added together give a palindrome (70507).

The spelling of 1670491 in words is "one million, six hundred seventy thousand, four hundred ninety-one".