51901849 has 2 divisors, whose sum is σ = 51901850. Its totient is φ = 51901848.

The previous prime is 51901847. The next prime is 51901873. The reversal of 51901849 is 94810915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50509449 + 1392400 = 7107^2 + 1180^2 .

It is a cyclic number.

It is not a de Polignac number, because 51901849 - 2¹ = 51901847 is a prime.

Together with 51901847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51901841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25950924 + 25950925.

It is an arithmetic number, because the mean of its divisors is an integer number (25950925).

Almost surely, 2^51901849 is an apocalyptic number.

It is an amenable number.

51901849 is a deficient number, since it is larger than the sum of its proper divisors (1).

51901849 is an equidigital number, since it uses as much as digits as its factorization.

51901849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 51901849 is about 7204.2937891233. The cubic root of 51901849 is about 373.0161282189.

The spelling of 51901849 in words is "fifty-one million, nine hundred one thousand, eight hundred forty-nine".