1902143891 has 2 divisors, whose sum is σ = 1902143892. Its totient is φ = 1902143890.

The previous prime is 1902143813. The next prime is 1902143917. The reversal of 1902143891 is 1983412091.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1902143891 - 2¹⁸ = 1901881747 is a prime.

It is not a weakly prime, because it can be changed into another prime (1902143491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 951071945 + 951071946.

It is an arithmetic number, because the mean of its divisors is an integer number (951071946).

Almost surely, 2^1902143891 is an apocalyptic number.

1902143891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1902143891 is an equidigital number, since it uses as much as digits as its factorization.

1902143891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1902143891 is about 43613.5746184602. The cubic root of 1902143891 is about 1239.0280041085.

The spelling of 1902143891 in words is "one billion, nine hundred two million, one hundred forty-three thousand, eight hundred ninety-one".