161487277 has 16 divisors (see below), whose sum is σ = 195668992. Its totient is φ = 130325760.

The previous prime is 161487257. The next prime is 161487311. The reversal of 161487277 is 772784161.

It is a cyclic number.

It is not a de Polignac number, because 161487277 - 2¹¹ = 161485229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161487247) 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, 2028 + ... + 18085.

It is an arithmetic number, because the mean of its divisors is an integer number (12229312).

Almost surely, 2^161487277 is an apocalyptic number.

It is an amenable number.

161487277 is a deficient number, since it is larger than the sum of its proper divisors (34181715).

161487277 is a wasteful number, since it uses less digits than its factorization.

161487277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20188.

The product of its digits is 131712, while the sum is 43.

The square root of 161487277 is about 12707.7644375398. The cubic root of 161487277 is about 544.5604592311.

The spelling of 161487277 in words is "one hundred sixty-one million, four hundred eighty-seven thousand, two hundred seventy-seven".