161869471 has 2 divisors, whose sum is σ = 161869472. Its totient is φ = 161869470.

The previous prime is 161869459. The next prime is 161869481. The reversal of 161869471 is 174968161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161869471 - 2¹¹ = 161867423 is a prime.

It is a super-3 number, since 3×161869471³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161869441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80934735 + 80934736.

It is an arithmetic number, because the mean of its divisors is an integer number (80934736).

Almost surely, 2^161869471 is an apocalyptic number.

161869471 is a deficient number, since it is larger than the sum of its proper divisors (1).

161869471 is an equidigital number, since it uses as much as digits as its factorization.

161869471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 161869471 is about 12722.7933646664. The cubic root of 161869471 is about 544.9897268215.

The spelling of 161869471 in words is "one hundred sixty-one million, eight hundred sixty-nine thousand, four hundred seventy-one".