161531351 has 8 divisors (see below), whose sum is σ = 164854800. Its totient is φ = 158241600.

The previous prime is 161531329. The next prime is 161531387. The reversal of 161531351 is 153135161.

161531351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161531351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161531351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161531551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1376 + ... + 18026.

It is an arithmetic number, because the mean of its divisors is an integer number (20606850).

Almost surely, 2^161531351 is an apocalyptic number.

161531351 is a deficient number, since it is larger than the sum of its proper divisors (3323449).

161531351 is a wasteful number, since it uses less digits than its factorization.

161531351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16849.

The product of its digits is 1350, while the sum is 26.

The square root of 161531351 is about 12709.4984558794. The cubic root of 161531351 is about 544.6099962079.

The spelling of 161531351 in words is "one hundred sixty-one million, five hundred thirty-one thousand, three hundred fifty-one".