161687411 has 2 divisors, whose sum is σ = 161687412. Its totient is φ = 161687410.

The previous prime is 161687399. The next prime is 161687417. The reversal of 161687411 is 114786161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161687411 - 2¹⁰ = 161686387 is a prime.

It is a super-2 number, since 2×161687411² = 52285637751765842, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (161687417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80843705 + 80843706.

It is an arithmetic number, because the mean of its divisors is an integer number (80843706).

Almost surely, 2^161687411 is an apocalyptic number.

161687411 is a deficient number, since it is larger than the sum of its proper divisors (1).

161687411 is an equidigital number, since it uses as much as digits as its factorization.

161687411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 161687411 is about 12715.6364764018. The cubic root of 161687411 is about 544.7853274551.

The spelling of 161687411 in words is "one hundred sixty-one million, six hundred eighty-seven thousand, four hundred eleven".