2106537309 has 6 divisors (see below), whose sum is σ = 3042776126. Its totient is φ = 1404358200.

The previous prime is 2106537289. The next prime is 2106537313. The reversal of 2106537309 is 9037356012.

It can be written as a sum of positive squares in only one way, i.e., 1622317284 + 484220025 = 40278^2 + 22005^2 .

It is not a de Polignac number, because 2106537309 - 2⁸ = 2106537053 is a prime.

It is a super-2 number, since 2×2106537309² = 8874998868417922962, 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 (2106537109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117029842 + ... + 117029859.

Almost surely, 2^2106537309 is an apocalyptic number.

It is an amenable number.

2106537309 is a deficient number, since it is larger than the sum of its proper divisors (936238817).

2106537309 is a wasteful number, since it uses less digits than its factorization.

2106537309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234059707 (or 234059704 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 2106537309 is about 45897.0294136777. The cubic root of 2106537309 is about 1281.9066046401.

The spelling of 2106537309 in words is "two billion, one hundred six million, five hundred thirty-seven thousand, three hundred nine".