1020423151543 has 4 divisors (see below), whose sum is σ = 1020432799000. Its totient is φ = 1020413504088.

The previous prime is 1020423151529. The next prime is 1020423151547. The reversal of 1020423151543 is 3451513240201.

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

It is a cyclic number.

It is not a de Polignac number, because 1020423151543 - 2²¹ = 1020421054391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020423151547) 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, 4663293 + ... + 4877206.

It is an arithmetic number, because the mean of its divisors is an integer number (255108199750).

Almost surely, 2^{1020423151543} is an apocalyptic number.

1020423151543 is a deficient number, since it is larger than the sum of its proper divisors (9647457).

1020423151543 is an equidigital number, since it uses as much as digits as its factorization.

1020423151543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9647456.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 1020423151543 its reverse (3451513240201), we get a palindrome (4471936391744).

The spelling of 1020423151543 in words is "one trillion, twenty billion, four hundred twenty-three million, one hundred fifty-one thousand, five hundred forty-three".