161634837 has 64 divisors (see below), whose sum is σ = 278691840. Its totient is φ = 81043200.

The previous prime is 161634829. The next prime is 161634857. The reversal of 161634837 is 738436161.

It is not a de Polignac number, because 161634837 - 2³ = 161634829 is a prime.

It is a super-2 number, since 2×161634837² = 52251641064033138, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 161634795 and 161634804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161634857) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 600739 + ... + 601007.

It is an arithmetic number, because the mean of its divisors is an integer number (4354560).

Almost surely, 2^161634837 is an apocalyptic number.

It is an amenable number.

161634837 is a deficient number, since it is larger than the sum of its proper divisors (117057003).

161634837 is a wasteful number, since it uses less digits than its factorization.

161634837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394.

The product of its digits is 72576, while the sum is 39.

The square root of 161634837 is about 12713.5690110999. The cubic root of 161634837 is about 544.7262739012.

The spelling of 161634837 in words is "one hundred sixty-one million, six hundred thirty-four thousand, eight hundred thirty-seven".