861624437 has 2 divisors, whose sum is σ = 861624438. Its totient is φ = 861624436.

The previous prime is 861624427. The next prime is 861624457. The reversal of 861624437 is 734426168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 742072081 + 119552356 = 27241^2 + 10934^2 .

It is a cyclic number.

It is not a de Polignac number, because 861624437 - 2²⁴ = 844847221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861624394 and 861624403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861624427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430812218 + 430812219.

It is an arithmetic number, because the mean of its divisors is an integer number (430812219).

Almost surely, 2^861624437 is an apocalyptic number.

It is an amenable number.

861624437 is a deficient number, since it is larger than the sum of its proper divisors (1).

861624437 is an equidigital number, since it uses as much as digits as its factorization.

861624437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 41.

The square root of 861624437 is about 29353.4399517331. The cubic root of 861624437 is about 951.5669199351.

The spelling of 861624437 in words is "eight hundred sixty-one million, six hundred twenty-four thousand, four hundred thirty-seven".