51269861 has 2 divisors, whose sum is σ = 51269862. Its totient is φ = 51269860.

The previous prime is 51269851. The next prime is 51269873. The reversal of 51269861 is 16896215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36784225 + 14485636 = 6065^2 + 3806^2 .

It is a cyclic number.

It is not a de Polignac number, because 51269861 - 2¹⁰ = 51268837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51269821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25634930 + 25634931.

It is an arithmetic number, because the mean of its divisors is an integer number (25634931).

Almost surely, 2^51269861 is an apocalyptic number.

It is an amenable number.

51269861 is a deficient number, since it is larger than the sum of its proper divisors (1).

51269861 is an equidigital number, since it uses as much as digits as its factorization.

51269861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 51269861 is about 7160.2975496833. The cubic root of 51269861 is about 371.4959184938.

The spelling of 51269861 in words is "fifty-one million, two hundred sixty-nine thousand, eight hundred sixty-one".