51958261 has 4 divisors (see below), whose sum is σ = 52670092. Its totient is φ = 51246432.

The previous prime is 51958259. The next prime is 51958267. The reversal of 51958261 is 16285915.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14516100 + 37442161 = 3810^2 + 6119^2 .

It is a cyclic number.

It is not a de Polignac number, because 51958261 - 2¹ = 51958259 is a prime.

It is a super-2 number, since 2×51958261² = 5399321772288242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51958261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51958267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355806 + ... + 355951.

It is an arithmetic number, because the mean of its divisors is an integer number (13167523).

Almost surely, 2^51958261 is an apocalyptic number.

It is an amenable number.

51958261 is a deficient number, since it is larger than the sum of its proper divisors (711831).

51958261 is an equidigital number, since it uses as much as digits as its factorization.

51958261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711830.

The product of its digits is 21600, while the sum is 37.

The square root of 51958261 is about 7208.2078910087. The cubic root of 51958261 is about 373.1512227427.

It can be divided in two parts, 5195 and 8261, that added together give a square (13456 = 116²).

The spelling of 51958261 in words is "fifty-one million, nine hundred fifty-eight thousand, two hundred sixty-one".