1670307491 has 2 divisors, whose sum is σ = 1670307492. Its totient is φ = 1670307490.

The previous prime is 1670307481. The next prime is 1670307503. The reversal of 1670307491 is 1947030761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1670307491 - 2⁶ = 1670307427 is a prime.

It is a super-2 number, since 2×1670307491² = 5579854228981430162, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1670307421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835153745 + 835153746.

It is an arithmetic number, because the mean of its divisors is an integer number (835153746).

Almost surely, 2^1670307491 is an apocalyptic number.

1670307491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670307491 is an equidigital number, since it uses as much as digits as its factorization.

1670307491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 1670307491 is about 40869.3955301519. The cubic root of 1670307491 is about 1186.4938085213.

The spelling of 1670307491 in words is "one billion, six hundred seventy million, three hundred seven thousand, four hundred ninety-one".