51405049 has 2 divisors, whose sum is σ = 51405050. Its totient is φ = 51405048.

The previous prime is 51405017. The next prime is 51405073. The reversal of 51405049 is 94050415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50694400 + 710649 = 7120^2 + 843^2 .

It is a cyclic number.

It is not a de Polignac number, because 51405049 - 2⁵ = 51405017 is a prime.

It is not a weakly prime, because it can be changed into another prime (51405749) 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, 25702524 + 25702525.

It is an arithmetic number, because the mean of its divisors is an integer number (25702525).

Almost surely, 2^51405049 is an apocalyptic number.

It is an amenable number.

51405049 is a deficient number, since it is larger than the sum of its proper divisors (1).

51405049 is an equidigital number, since it uses as much as digits as its factorization.

51405049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51405049 is about 7169.7314454587. The cubic root of 51405049 is about 371.8221511791.

The spelling of 51405049 in words is "fifty-one million, four hundred five thousand, forty-nine".