1640998571 has 2 divisors, whose sum is σ = 1640998572. Its totient is φ = 1640998570.

The previous prime is 1640998531. The next prime is 1640998577. The reversal of 1640998571 is 1758990461.

It is a strong prime.

It is an emirp because it is prime and its reverse (1758990461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640998571 - 2³⁰ = 567256747 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640998577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820499285 + 820499286.

It is an arithmetic number, because the mean of its divisors is an integer number (820499286).

Almost surely, 2^1640998571 is an apocalyptic number.

1640998571 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640998571 is an equidigital number, since it uses as much as digits as its factorization.

1640998571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 1640998571 is about 40509.2405631110. The cubic root of 1640998571 is about 1179.5130066936.

The spelling of 1640998571 in words is "one billion, six hundred forty million, nine hundred ninety-eight thousand, five hundred seventy-one".