1642431101 has 2 divisors, whose sum is σ = 1642431102. Its totient is φ = 1642431100.

The previous prime is 1642431067. The next prime is 1642431163. The reversal of 1642431101 is 1011342461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1463139001 + 179292100 = 38251^2 + 13390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642431101 - 2²² = 1638236797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642431601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821215550 + 821215551.

It is an arithmetic number, because the mean of its divisors is an integer number (821215551).

Almost surely, 2^1642431101 is an apocalyptic number.

It is an amenable number.

1642431101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642431101 is an equidigital number, since it uses as much as digits as its factorization.

1642431101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1642431101 is about 40526.9182272721. The cubic root of 1642431101 is about 1179.8561303577.

Adding to 1642431101 its reverse (1011342461), we get a palindrome (2653773562).

The spelling of 1642431101 in words is "one billion, six hundred forty-two million, four hundred thirty-one thousand, one hundred one".