1605056631 has 4 divisors (see below), whose sum is σ = 2140075512. Its totient is φ = 1070037752.

The previous prime is 1605056617. The next prime is 1605056647. The reversal of 1605056631 is 1366505061.

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 1605056631 - 2³⁰ = 531314807 is a prime.

It is a super-2 number, since 2×1605056631² = 5152413577434140322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1605056592 and 1605056601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605055631) 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, 267509436 + ... + 267509441.

It is an arithmetic number, because the mean of its divisors is an integer number (535018878).

Almost surely, 2^1605056631 is an apocalyptic number.

1605056631 is a deficient number, since it is larger than the sum of its proper divisors (535018881).

1605056631 is an equidigital number, since it uses as much as digits as its factorization.

1605056631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535018880.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 1605056631 is about 40063.1580257972. The cubic root of 1605056631 is about 1170.8379394383.

The spelling of 1605056631 in words is "one billion, six hundred five million, fifty-six thousand, six hundred thirty-one".