1020111500431 has 4 divisors (see below), whose sum is σ = 1020224767072. Its totient is φ = 1019998233792.

The previous prime is 1020111500407. The next prime is 1020111500477. The reversal of 1020111500431 is 1340051110201.

1020111500431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1020111500431 - 2¹⁵ = 1020111467663 is a prime.

It is a super-2 number, since 2×1020111500431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020111500399 and 1020111500408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020111500231) 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, 56619810 + ... + 56637823.

It is an arithmetic number, because the mean of its divisors is an integer number (255056191768).

Almost surely, 2^{1020111500431} is an apocalyptic number.

1020111500431 is a deficient number, since it is larger than the sum of its proper divisors (113266641).

1020111500431 is an equidigital number, since it uses as much as digits as its factorization.

1020111500431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113266640.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 1020111500431 its reverse (1340051110201), we get a palindrome (2360162610632).

The spelling of 1020111500431 in words is "one trillion, twenty billion, one hundred eleven million, five hundred thousand, four hundred thirty-one".