16787961 has 6 divisors (see below), whose sum is σ = 24249290. Its totient is φ = 11191968.

The previous prime is 16787941. The next prime is 16787987. The reversal of 16787961 is 16978761.

It can be written as a sum of positive squares in only one way, i.e., 14288400 + 2499561 = 3780^2 + 1581^2 .

It is not a de Polignac number, because 16787961 - 2⁵ = 16787929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16787921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 932656 + ... + 932673.

Almost surely, 2^16787961 is an apocalyptic number.

It is an amenable number.

16787961 is a deficient number, since it is larger than the sum of its proper divisors (7461329).

16787961 is a wasteful number, since it uses less digits than its factorization.

16787961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865335 (or 1865332 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 16787961 is about 4097.3114355636. The cubic root of 16787961 is about 256.0546402330.

The spelling of 16787961 in words is "sixteen million, seven hundred eighty-seven thousand, nine hundred sixty-one".