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252440861 is a prime number
BaseRepresentation
bin11110000101111…
…11000100011101
3122121000022202112
433002333010131
51004111101421
641014403405
76153466121
oct1702770435
9577008675
10252440861
1111a550612
1270660565
13403b86ba
1425753581
151726745b
hexf0bf11d

252440861 has 2 divisors, whose sum is σ = 252440862. Its totient is φ = 252440860.

The previous prime is 252440857. The next prime is 252440863. The reversal of 252440861 is 168044252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163968025 + 88472836 = 12805^2 + 9406^2 .

It is a cyclic number.

It is not a de Polignac number, because 252440861 - 22 = 252440857 is a prime.

Together with 252440863, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p13805492 and since 252440861 and 13805492 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 (252440863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126220430 + 126220431.

It is an arithmetic number, because the mean of its divisors is an integer number (126220431).

Almost surely, 2252440861 is an apocalyptic number.

It is an amenable number.

252440861 is a deficient number, since it is larger than the sum of its proper divisors (1).

252440861 is an equidigital number, since it uses as much as digits as its factorization.

252440861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 252440861 is about 15888.3876148588. The cubic root of 252440861 is about 632.0040833537.

The spelling of 252440861 in words is "two hundred fifty-two million, four hundred forty thousand, eight hundred sixty-one".