53437781 has 2 divisors, whose sum is σ = 53437782. Its totient is φ = 53437780.

The previous prime is 53437751. The next prime is 53437799. The reversal of 53437781 is 18773435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 1681 = 7310^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 53437781 - 2¹⁴ = 53421397 is a prime.

It is a super-2 number, since 2×53437781² = 5711192876407922, which contains 22 as substring.

It is equal to p_3194678 and since 53437781 and 3194678 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53437711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26718890 + 26718891.

It is an arithmetic number, because the mean of its divisors is an integer number (26718891).

Almost surely, 2^53437781 is an apocalyptic number.

It is an amenable number.

53437781 is a deficient number, since it is larger than the sum of its proper divisors (1).

53437781 is an equidigital number, since it uses as much as digits as its factorization.

53437781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 38.

The square root of 53437781 is about 7310.1149785759. The cubic root of 53437781 is about 376.6599738632.

The spelling of 53437781 in words is "fifty-three million, four hundred thirty-seven thousand, seven hundred eighty-one".