161758947 has 18 divisors (see below), whose sum is σ = 251130828. Its totient is φ = 92345568.

The previous prime is 161758889. The next prime is 161758963. The reversal of 161758947 is 749857161.

It is not a de Polignac number, because 161758947 - 2⁸ = 161758691 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161758896 and 161758905.

It is not an unprimeable number, because it can be changed into a prime (161758447) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 153679 + ... + 154727.

Almost surely, 2^161758947 is an apocalyptic number.

161758947 is a deficient number, since it is larger than the sum of its proper divisors (89371881).

161758947 is an frugal number, since it uses more digits than its factorization.

161758947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115 (or 1059 counting only the distinct ones).

The product of its digits is 423360, while the sum is 48.

The square root of 161758947 is about 12718.4490799783. The cubic root of 161758947 is about 544.8656594506.

Multiplying 161758947 by its sum of digits (48), we get a square (7764429456 = 88116²).

The spelling of 161758947 in words is "one hundred sixty-one million, seven hundred fifty-eight thousand, nine hundred forty-seven".