1020312023531 has 4 divisors (see below), whose sum is σ = 1028100665064. Its totient is φ = 1012523382000.

The previous prime is 1020312023501. The next prime is 1020312023537. The reversal of 1020312023531 is 1353202130201.

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 1020312023531 - 2¹⁴ = 1020312007147 is a prime.

It is a super-2 number, since 2×1020312023531² (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 = 1020312023497 and 1020312023506.

It is not an unprimeable number, because it can be changed into a prime (1020312023537) 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, 3894320570 + ... + 3894320831.

It is an arithmetic number, because the mean of its divisors is an integer number (257025166266).

Almost surely, 2^{1020312023531} is an apocalyptic number.

1020312023531 is a deficient number, since it is larger than the sum of its proper divisors (7788641533).

1020312023531 is an equidigital number, since it uses as much as digits as its factorization.

1020312023531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7788641532.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 1020312023531 its reverse (1353202130201), we get a palindrome (2373514153732).

The spelling of 1020312023531 in words is "one trillion, twenty billion, three hundred twelve million, twenty-three thousand, five hundred thirty-one".