161507331 has 32 divisors (see below), whose sum is σ = 247060800. Its totient is φ = 104198400.

The previous prime is 161507329. The next prime is 161507389. The reversal of 161507331 is 133705161.

It is not a de Polignac number, because 161507331 - 2¹ = 161507329 is a prime.

It is a super-2 number, since 2×161507331² = 52169235933487122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 161507295 and 161507304.

It is not an unprimeable number, because it can be changed into a prime (161500331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268431 + ... + 269031.

It is an arithmetic number, because the mean of its divisors is an integer number (7720650).

Almost surely, 2^161507331 is an apocalyptic number.

161507331 is a deficient number, since it is larger than the sum of its proper divisors (85553469).

161507331 is a wasteful number, since it uses less digits than its factorization.

161507331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 161507331 is about 12708.5534582029. The cubic root of 161507331 is about 544.5830000438.

The spelling of 161507331 in words is "one hundred sixty-one million, five hundred seven thousand, three hundred thirty-one".