1020155035531 has 4 divisors (see below), whose sum is σ = 1020158321392. Its totient is φ = 1020151749672.

The previous prime is 1020155035507. The next prime is 1020155035547. The reversal of 1020155035531 is 1355305510201.

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 1020155035531 - 2¹¹ = 1020155033483 is a prime.

It is a super-2 number, since 2×1020155035531² (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 = 1020155035493 and 1020155035502.

It is not an unprimeable number, because it can be changed into a prime (1020155035591) 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, 1122216 + ... + 1816501.

It is an arithmetic number, because the mean of its divisors is an integer number (255039580348).

Almost surely, 2^{1020155035531} is an apocalyptic number.

1020155035531 is a deficient number, since it is larger than the sum of its proper divisors (3285861).

1020155035531 is an equidigital number, since it uses as much as digits as its factorization.

1020155035531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285860.

The product of its (nonzero) digits is 11250, while the sum is 31.

The spelling of 1020155035531 in words is "one trillion, twenty billion, one hundred fifty-five million, thirty-five thousand, five hundred thirty-one".