51556061 has 2 divisors, whose sum is σ = 51556062. Its totient is φ = 51556060.

The previous prime is 51556049. The next prime is 51556079. The reversal of 51556061 is 16065515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33756100 + 17799961 = 5810^2 + 4219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51556061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51559061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25778030 + 25778031.

It is an arithmetic number, because the mean of its divisors is an integer number (25778031).

Almost surely, 2^51556061 is an apocalyptic number.

It is an amenable number.

51556061 is a deficient number, since it is larger than the sum of its proper divisors (1).

51556061 is an equidigital number, since it uses as much as digits as its factorization.

51556061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51556061 is about 7180.2549397636. The cubic root of 51556061 is about 372.1858943911.

The spelling of 51556061 in words is "fifty-one million, five hundred fifty-six thousand, sixty-one".