420692861 has 2 divisors, whose sum is σ = 420692862. Its totient is φ = 420692860.

The previous prime is 420692843. The next prime is 420692969. The reversal of 420692861 is 168296024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420660100 + 32761 = 20510^2 + 181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420692861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420692161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210346430 + 210346431.

It is an arithmetic number, because the mean of its divisors is an integer number (210346431).

Almost surely, 2^420692861 is an apocalyptic number.

It is an amenable number.

420692861 is a deficient number, since it is larger than the sum of its proper divisors (1).

420692861 is an equidigital number, since it uses as much as digits as its factorization.

420692861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 420692861 is about 20510.7986436414. The cubic root of 420692861 is about 749.2988178476.

The spelling of 420692861 in words is "four hundred twenty million, six hundred ninety-two thousand, eight hundred sixty-one".