43513020553 has 2 divisors, whose sum is σ = 43513020554. Its totient is φ = 43513020552.

The previous prime is 43513020539. The next prime is 43513020581. The reversal of 43513020553 is 35502031534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23905179769 + 19607840784 = 154613^2 + 140028^2 .

It is a cyclic number.

It is not a de Polignac number, because 43513020553 - 2⁵ = 43513020521 is a prime.

It is not a weakly prime, because it can be changed into another prime (43513020583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21756510276 + 21756510277.

It is an arithmetic number, because the mean of its divisors is an integer number (21756510277).

Almost surely, 2^43513020553 is an apocalyptic number.

It is an amenable number.

43513020553 is a deficient number, since it is larger than the sum of its proper divisors (1).

43513020553 is an equidigital number, since it uses as much as digits as its factorization.

43513020553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 31.

The spelling of 43513020553 in words is "forty-three billion, five hundred thirteen million, twenty thousand, five hundred fifty-three".