51265561 has 2 divisors, whose sum is σ = 51265562. Its totient is φ = 51265560.

The previous prime is 51265517. The next prime is 51265601. The reversal of 51265561 is 16556215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45481536 + 5784025 = 6744^2 + 2405^2 .

It is a cyclic number.

It is not a de Polignac number, because 51265561 - 2¹³ = 51257369 is a prime.

It is not a weakly prime, because it can be changed into another prime (51265061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25632780 + 25632781.

It is an arithmetic number, because the mean of its divisors is an integer number (25632781).

Almost surely, 2^51265561 is an apocalyptic number.

It is an amenable number.

51265561 is a deficient number, since it is larger than the sum of its proper divisors (1).

51265561 is an equidigital number, since it uses as much as digits as its factorization.

51265561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

The square root of 51265561 is about 7159.9972765358. The cubic root of 51265561 is about 371.4855324237.

The spelling of 51265561 in words is "fifty-one million, two hundred sixty-five thousand, five hundred sixty-one".