51420449 has 2 divisors, whose sum is σ = 51420450. Its totient is φ = 51420448.

The previous prime is 51420443. The next prime is 51420463. The reversal of 51420449 is 94402415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50865424 + 555025 = 7132^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 51420449 - 2¹² = 51416353 is a prime.

It is not a weakly prime, because it can be changed into another prime (51420443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25710224 + 25710225.

It is an arithmetic number, because the mean of its divisors is an integer number (25710225).

Almost surely, 2^51420449 is an apocalyptic number.

It is an amenable number.

51420449 is a deficient number, since it is larger than the sum of its proper divisors (1).

51420449 is an equidigital number, since it uses as much as digits as its factorization.

51420449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 51420449 is about 7170.8053243691. The cubic root of 51420449 is about 371.8592778138.

The spelling of 51420449 in words is "fifty-one million, four hundred twenty thousand, four hundred forty-nine".