1870420091 has 2 divisors, whose sum is σ = 1870420092. Its totient is φ = 1870420090.

The previous prime is 1870420081. The next prime is 1870420103. The reversal of 1870420091 is 1900240781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1870420091 - 2¹⁴ = 1870403707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1870420031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935210045 + 935210046.

It is an arithmetic number, because the mean of its divisors is an integer number (935210046).

Almost surely, 2^1870420091 is an apocalyptic number.

1870420091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1870420091 is an equidigital number, since it uses as much as digits as its factorization.

1870420091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1870420091 is about 43248.3536218432. The cubic root of 1870420091 is about 1232.1012162004.

The spelling of 1870420091 in words is "one billion, eight hundred seventy million, four hundred twenty thousand, ninety-one".