51499161 has 24 divisors (see below), whose sum is σ = 85205120. Its totient is φ = 29362176.

The previous prime is 51499127. The next prime is 51499163. The reversal of 51499161 is 16199415.

51499161 is a `hidden beast` number, since 5 + 1 + 499 + 161 = 666.

It is not a de Polignac number, because 51499161 - 2¹¹ = 51497113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51499163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47916 + ... + 48978.

Almost surely, 2^51499161 is an apocalyptic number.

It is an amenable number.

51499161 is a deficient number, since it is larger than the sum of its proper divisors (33705959).

51499161 is a wasteful number, since it uses less digits than its factorization.

51499161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845 (or 1842 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 51499161 is about 7176.2915910657. The cubic root of 51499161 is about 372.0489226327.

The spelling of 51499161 in words is "fifty-one million, four hundred ninety-nine thousand, one hundred sixty-one".