161310437 has 4 divisors (see below), whose sum is σ = 169800480. Its totient is φ = 152820396.

The previous prime is 161310427. The next prime is 161310451. The reversal of 161310437 is 734013161.

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 not a de Polignac number, because 161310437 - 2²² = 157116133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161310407) 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, 4244993 + ... + 4245030.

It is an arithmetic number, because the mean of its divisors is an integer number (42450120).

Almost surely, 2^161310437 is an apocalyptic number.

It is an amenable number.

161310437 is a deficient number, since it is larger than the sum of its proper divisors (8490043).

161310437 is an equidigital number, since it uses as much as digits as its factorization.

161310437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8490042.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 161310437 is about 12700.8045808130. The cubic root of 161310437 is about 544.3616092110.

Adding to 161310437 its reverse (734013161), we get a palindrome (895323598).

The spelling of 161310437 in words is "one hundred sixty-one million, three hundred ten thousand, four hundred thirty-seven".