161037309 has 4 divisors (see below), whose sum is σ = 214716416. Its totient is φ = 107358204.

The previous prime is 161037287. The next prime is 161037337. The reversal of 161037309 is 903730161.

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 not a de Polignac number, because 161037309 - 2¹⁶ = 160971773 is a prime.

It is a super-2 number, since 2×161037309² = 51866029779922962, 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 (161037509) 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, 26839549 + ... + 26839554.

It is an arithmetic number, because the mean of its divisors is an integer number (53679104).

Almost surely, 2^161037309 is an apocalyptic number.

It is an amenable number.

161037309 is a deficient number, since it is larger than the sum of its proper divisors (53679107).

161037309 is an equidigital number, since it uses as much as digits as its factorization.

161037309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53679106.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 161037309 is about 12690.0476358444. The cubic root of 161037309 is about 544.0542011397.

The spelling of 161037309 in words is "one hundred sixty-one million, thirty-seven thousand, three hundred nine".