1020660631 has 4 divisors (see below), whose sum is σ = 1030024600. Its totient is φ = 1011296664.

The previous prime is 1020660623. The next prime is 1020660649. The reversal of 1020660631 is 1360660201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1360660201 = 2267 ⋅600203.

It is a cyclic number.

It is not a de Polignac number, because 1020660631 - 2³ = 1020660623 is a prime.

It is a super-2 number, since 2×1020660631² = 2083496247346636322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020660596 and 1020660605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020666631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4681821 + ... + 4682038.

It is an arithmetic number, because the mean of its divisors is an integer number (257506150).

Almost surely, 2^1020660631 is an apocalyptic number.

1020660631 is a deficient number, since it is larger than the sum of its proper divisors (9363969).

1020660631 is an equidigital number, since it uses as much as digits as its factorization.

1020660631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9363968.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1020660631 is about 31947.7797507119. The cubic root of 1020660631 is about 1006.8399849356.

The spelling of 1020660631 in words is "one billion, twenty million, six hundred sixty thousand, six hundred thirty-one".