1998914971 has 2 divisors, whose sum is σ = 1998914972. Its totient is φ = 1998914970.

The previous prime is 1998914963. The next prime is 1998914977. The reversal of 1998914971 is 1794198991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1998914971 - 2³ = 1998914963 is a prime.

It is a super-2 number, since 2×1998914971² = 7991322122575861682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1998914977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999457485 + 999457486.

It is an arithmetic number, because the mean of its divisors is an integer number (999457486).

Almost surely, 2^1998914971 is an apocalyptic number.

1998914971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998914971 is an equidigital number, since it uses as much as digits as its factorization.

1998914971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 58.

The square root of 1998914971 is about 44709.2269112316. The cubic root of 1998914971 is about 1259.6931668671.

The spelling of 1998914971 in words is "one billion, nine hundred ninety-eight million, nine hundred fourteen thousand, nine hundred seventy-one".