624238261 has 2 divisors, whose sum is σ = 624238262. Its totient is φ = 624238260.

The previous prime is 624238259. The next prime is 624238273. The reversal of 624238261 is 162832426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386122500 + 238115761 = 19650^2 + 15431^2 .

It is a cyclic number.

It is not a de Polignac number, because 624238261 - 2¹ = 624238259 is a prime.

Together with 624238259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (624238201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312119130 + 312119131.

It is an arithmetic number, because the mean of its divisors is an integer number (312119131).

Almost surely, 2^624238261 is an apocalyptic number.

It is an amenable number.

624238261 is a deficient number, since it is larger than the sum of its proper divisors (1).

624238261 is an equidigital number, since it uses as much as digits as its factorization.

624238261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 34.

The square root of 624238261 is about 24984.7605751986. The cubic root of 624238261 is about 854.6404840308.

The spelling of 624238261 in words is "six hundred twenty-four million, two hundred thirty-eight thousand, two hundred sixty-one".