1642436461 has 2 divisors, whose sum is σ = 1642436462. Its totient is φ = 1642436460.

The previous prime is 1642436443. The next prime is 1642436531. The reversal of 1642436461 is 1646342461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1639440100 + 2996361 = 40490^2 + 1731^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642436461 - 2⁷ = 1642436333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1642436461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642406461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821218230 + 821218231.

It is an arithmetic number, because the mean of its divisors is an integer number (821218231).

Almost surely, 2^1642436461 is an apocalyptic number.

It is an amenable number.

1642436461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642436461 is an equidigital number, since it uses as much as digits as its factorization.

1642436461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 37.

The square root of 1642436461 is about 40526.9843561053. The cubic root of 1642436461 is about 1179.8574138255.

The spelling of 1642436461 in words is "one billion, six hundred forty-two million, four hundred thirty-six thousand, four hundred sixty-one".