51913261 has 2 divisors, whose sum is σ = 51913262. Its totient is φ = 51913260.

The previous prime is 51913249. The next prime is 51913289. The reversal of 51913261 is 16231915.

It is an a-pointer prime, because the next prime (51913289) can be obtained adding 51913261 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31573161 + 20340100 = 5619^2 + 4510^2 .

It is a cyclic number.

It is not a de Polignac number, because 51913261 - 2¹¹ = 51911213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51913361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25956630 + 25956631.

It is an arithmetic number, because the mean of its divisors is an integer number (25956631).

Almost surely, 2^51913261 is an apocalyptic number.

It is an amenable number.

51913261 is a deficient number, since it is larger than the sum of its proper divisors (1).

51913261 is an equidigital number, since it uses as much as digits as its factorization.

51913261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 28.

The square root of 51913261 is about 7205.0857732577. The cubic root of 51913261 is about 373.0434653831.

The spelling of 51913261 in words is "fifty-one million, nine hundred thirteen thousand, two hundred sixty-one".