51451549 has 2 divisors, whose sum is σ = 51451550. Its totient is φ = 51451548.

The previous prime is 51451541. The next prime is 51451559. The reversal of 51451549 is 94515415.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33431524 + 18020025 = 5782^2 + 4245^2 .

It is a cyclic number.

It is not a de Polignac number, because 51451549 - 2³ = 51451541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51451541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25725774 + 25725775.

It is an arithmetic number, because the mean of its divisors is an integer number (25725775).

Almost surely, 2^51451549 is an apocalyptic number.

It is an amenable number.

51451549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51451549 is an equidigital number, since it uses as much as digits as its factorization.

51451549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 34.

The square root of 51451549 is about 7172.9735117314. The cubic root of 51451549 is about 371.9342317346.

The spelling of 51451549 in words is "fifty-one million, four hundred fifty-one thousand, five hundred forty-nine".