1642646371 has 2 divisors, whose sum is σ = 1642646372. Its totient is φ = 1642646370.

The previous prime is 1642646359. The next prime is 1642646377. The reversal of 1642646371 is 1736462461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1642646371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642646377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821323185 + 821323186.

It is an arithmetic number, because the mean of its divisors is an integer number (821323186).

Almost surely, 2^1642646371 is an apocalyptic number.

1642646371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642646371 is an equidigital number, since it uses as much as digits as its factorization.

1642646371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 40.

The square root of 1642646371 is about 40529.5740293431. The cubic root of 1642646371 is about 1179.9076751954.

The spelling of 1642646371 in words is "one billion, six hundred forty-two million, six hundred forty-six thousand, three hundred seventy-one".