51011549 has 2 divisors, whose sum is σ = 51011550. Its totient is φ = 51011548.

The previous prime is 51011533. The next prime is 51011557. The reversal of 51011549 is 94511015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27489049 + 23522500 = 5243^2 + 4850^2 .

It is a cyclic number.

It is not a de Polignac number, because 51011549 - 2⁴ = 51011533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51014549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25505774 + 25505775.

It is an arithmetic number, because the mean of its divisors is an integer number (25505775).

Almost surely, 2^51011549 is an apocalyptic number.

It is an amenable number.

51011549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51011549 is an equidigital number, since it uses as much as digits as its factorization.

51011549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 51011549 is about 7142.2369745060. The cubic root of 51011549 is about 370.8709673991.

The spelling of 51011549 in words is "fifty-one million, eleven thousand, five hundred forty-nine".