51440149 has 2 divisors, whose sum is σ = 51440150. Its totient is φ = 51440148.

The previous prime is 51440111. The next prime is 51440159. The reversal of 51440149 is 94104415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40832100 + 10608049 = 6390^2 + 3257^2 .

It is a cyclic number.

It is not a de Polignac number, because 51440149 - 2⁷ = 51440021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51440159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25720074 + 25720075.

It is an arithmetic number, because the mean of its divisors is an integer number (25720075).

Almost surely, 2^51440149 is an apocalyptic number.

It is an amenable number.

51440149 is a deficient number, since it is larger than the sum of its proper divisors (1).

51440149 is an equidigital number, since it uses as much as digits as its factorization.

51440149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 51440149 is about 7172.1788181835. The cubic root of 51440149 is about 371.9067601714.

The spelling of 51440149 in words is "fifty-one million, four hundred forty thousand, one hundred forty-nine".