51900181 has 2 divisors, whose sum is σ = 51900182. Its totient is φ = 51900180.

The previous prime is 51900179. The next prime is 51900217. The reversal of 51900181 is 18100915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41602500 + 10297681 = 6450^2 + 3209^2 .

It is a cyclic number.

It is not a de Polignac number, because 51900181 - 2¹ = 51900179 is a prime.

It is a super-2 number, since 2×51900181² = 5387257575665522, which contains 22 as substring.

Together with 51900179, 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 (51900131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25950090 + 25950091.

It is an arithmetic number, because the mean of its divisors is an integer number (25950091).

Almost surely, 2^51900181 is an apocalyptic number.

It is an amenable number.

51900181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51900181 is an equidigital number, since it uses as much as digits as its factorization.

51900181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 51900181 is about 7204.1780238970. The cubic root of 51900181 is about 373.0121322305.

The spelling of 51900181 in words is "fifty-one million, nine hundred thousand, one hundred eighty-one".