1606631081 has 4 divisors (see below), whose sum is σ = 1752688464. Its totient is φ = 1460573700.

The previous prime is 1606631027. The next prime is 1606631111. The reversal of 1606631081 is 1801366061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606631081 is a prime.

It is a super-2 number, since 2×1606631081² = 5162526860870457122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1606631021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73028675 + ... + 73028696.

It is an arithmetic number, because the mean of its divisors is an integer number (438172116).

Almost surely, 2^1606631081 is an apocalyptic number.

1606631081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1606631081 is a deficient number, since it is larger than the sum of its proper divisors (146057383).

1606631081 is a wasteful number, since it uses less digits than its factorization.

1606631081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146057382.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1606631081 is about 40082.8028086859. The cubic root of 1606631081 is about 1171.2206514516.

The spelling of 1606631081 in words is "one billion, six hundred six million, six hundred thirty-one thousand, eighty-one".