861422501 has 2 divisors, whose sum is σ = 861422502. Its totient is φ = 861422500.

The previous prime is 861422489. The next prime is 861422509. The reversal of 861422501 is 105224168.

It is a Cunningham number, because it is equal to 29350²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 861422500 + 1 = 29350^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 861422501 - 2¹⁸ = 861160357 is a prime.

It is a Chen prime.

It is equal to p_44136803 and since 861422501 and 44136803 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861422509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430711250 + 430711251.

It is an arithmetic number, because the mean of its divisors is an integer number (430711251).

Almost surely, 2^861422501 is an apocalyptic number.

It is an amenable number.

861422501 is a deficient number, since it is larger than the sum of its proper divisors (1).

861422501 is an equidigital number, since it uses as much as digits as its factorization.

861422501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 861422501 is about 29350.0000170358. Note that the first 4 decimals coincide. The cubic root of 861422501 is about 951.4925756219.

Adding to 861422501 its reverse (105224168), we get a palindrome (966646669).

The spelling of 861422501 in words is "eight hundred sixty-one million, four hundred twenty-two thousand, five hundred one".