161431917 has 16 divisors (see below), whose sum is σ = 224944128. Its totient is φ = 102784880.

The previous prime is 161431903. The next prime is 161431927. The reversal of 161431917 is 719134161.

It is a cyclic number.

It is not a de Polignac number, because 161431917 - 2¹² = 161427821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161431927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58192 + ... + 60902.

It is an arithmetic number, because the mean of its divisors is an integer number (14059008).

Almost surely, 2^161431917 is an apocalyptic number.

It is an amenable number.

161431917 is a deficient number, since it is larger than the sum of its proper divisors (63512211).

161431917 is a wasteful number, since it uses less digits than its factorization.

161431917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600.

The product of its digits is 4536, while the sum is 33.

The square root of 161431917 is about 12705.5860549602. The cubic root of 161431917 is about 544.4982245808.

The spelling of 161431917 in words is "one hundred sixty-one million, four hundred thirty-one thousand, nine hundred seventeen".