1906602491 has 2 divisors, whose sum is σ = 1906602492. Its totient is φ = 1906602490.

The previous prime is 1906602473. The next prime is 1906602497. The reversal of 1906602491 is 1942066091.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1906602491 - 2³⁰ = 832860667 is a prime.

It is not a weakly prime, because it can be changed into another prime (1906602497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 953301245 + 953301246.

It is an arithmetic number, because the mean of its divisors is an integer number (953301246).

Almost surely, 2^1906602491 is an apocalyptic number.

1906602491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1906602491 is an equidigital number, since it uses as much as digits as its factorization.

1906602491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1906602491 is about 43664.6595200283. The cubic root of 1906602491 is about 1239.9953370879.

The spelling of 1906602491 in words is "one billion, nine hundred six million, six hundred two thousand, four hundred ninety-one".