861624047 has 2 divisors, whose sum is σ = 861624048. Its totient is φ = 861624046.

The previous prime is 861624011. The next prime is 861624059. The reversal of 861624047 is 740426168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861624047 - 2²² = 857429743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861624047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861624847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430812023 + 430812024.

It is an arithmetic number, because the mean of its divisors is an integer number (430812024).

Almost surely, 2^861624047 is an apocalyptic number.

861624047 is a deficient number, since it is larger than the sum of its proper divisors (1).

861624047 is an equidigital number, since it uses as much as digits as its factorization.

861624047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 861624047 is about 29353.4333085586. The cubic root of 861624047 is about 951.5667763648.

It can be divided in two parts, 86162 and 4047, that added together give a palindrome (90209).

The spelling of 861624047 in words is "eight hundred sixty-one million, six hundred twenty-four thousand, forty-seven".