52501781 has 2 divisors, whose sum is σ = 52501782. Its totient is φ = 52501780.

The previous prime is 52501739. The next prime is 52501793. The reversal of 52501781 is 18710525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33062500 + 19439281 = 5750^2 + 4409^2 .

It is a cyclic number.

It is not a de Polignac number, because 52501781 - 2⁶ = 52501717 is a prime.

It is a super-2 number, since 2×52501781² = 5512874016343922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52501081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26250890 + 26250891.

It is an arithmetic number, because the mean of its divisors is an integer number (26250891).

Almost surely, 2^52501781 is an apocalyptic number.

It is an amenable number.

52501781 is a deficient number, since it is larger than the sum of its proper divisors (1).

52501781 is an equidigital number, since it uses as much as digits as its factorization.

52501781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 52501781 is about 7245.8112727285. The cubic root of 52501781 is about 374.4478534977.

The spelling of 52501781 in words is "fifty-two million, five hundred one thousand, seven hundred eighty-one".