1606634261 has 4 divisors (see below), whose sum is σ = 1614708000. Its totient is φ = 1598560524.

The previous prime is 1606634231. The next prime is 1606634291. The reversal of 1606634261 is 1624366061.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1624366061 = 197 ⋅8245513.

It is an interprime number because it is at equal distance from previous prime (1606634231) and next prime (1606634291).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606634261 is a prime.

It is a super-2 number, since 2×1606634261² = 5162547297238032242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606634231) 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, 4036571 + ... + 4036968.

It is an arithmetic number, because the mean of its divisors is an integer number (403677000).

Almost surely, 2^1606634261 is an apocalyptic number.

It is an amenable number.

1606634261 is a deficient number, since it is larger than the sum of its proper divisors (8073739).

1606634261 is an equidigital number, since it uses as much as digits as its factorization.

1606634261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8073738.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 1606634261 is about 40082.8424765510. The cubic root of 1606634261 is about 1171.2214241823.

The spelling of 1606634261 in words is "one billion, six hundred six million, six hundred thirty-four thousand, two hundred sixty-one".