1020355305531 has 8 divisors (see below), whose sum is σ = 1360568203584. Its totient is φ = 680189638920.

The previous prime is 1020355305521. The next prime is 1020355305617. The reversal of 1020355305531 is 1355035530201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1020355305531 - 2²⁷ = 1020221087803 is a prime.

It is a super-2 number, since 2×1020355305531² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1020355305492 and 1020355305501.

It is not an unprimeable number, because it can be changed into a prime (1020355305521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11757421 + ... + 11843886.

It is an arithmetic number, because the mean of its divisors is an integer number (170071025448).

Almost surely, 2^{1020355305531} is an apocalyptic number.

1020355305531 is a deficient number, since it is larger than the sum of its proper divisors (340212898053).

1020355305531 is a wasteful number, since it uses less digits than its factorization.

1020355305531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23615721.

The product of its (nonzero) digits is 33750, while the sum is 33.

The spelling of 1020355305531 in words is "one trillion, twenty billion, three hundred fifty-five million, three hundred five thousand, five hundred thirty-one".