51742261 has 2 divisors, whose sum is σ = 51742262. Its totient is φ = 51742260.

The previous prime is 51742241. The next prime is 51742267. The reversal of 51742261 is 16224715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42706225 + 9036036 = 6535^2 + 3006^2 .

It is a cyclic number.

It is not a de Polignac number, because 51742261 - 2⁷ = 51742133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51742267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25871130 + 25871131.

It is an arithmetic number, because the mean of its divisors is an integer number (25871131).

Almost surely, 2^51742261 is an apocalyptic number.

It is an amenable number.

51742261 is a deficient number, since it is larger than the sum of its proper divisors (1).

51742261 is an equidigital number, since it uses as much as digits as its factorization.

51742261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 28.

The square root of 51742261 is about 7193.2093671740. The cubic root of 51742261 is about 372.6334185681.

Adding to 51742261 its reverse (16224715), we get a palindrome (67966976).

It can be divided in two parts, 51742 and 261, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 51742261 in words is "fifty-one million, seven hundred forty-two thousand, two hundred sixty-one".