51491461 has 16 divisors (see below), whose sum is σ = 61254144. Its totient is φ = 42367104.

The previous prime is 51491459. The next prime is 51491467. The reversal of 51491461 is 16419415.

It is a cyclic number.

It is not a de Polignac number, because 51491461 - 2¹ = 51491459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51491467) 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 15 ways as a sum of consecutive naturals, for example, 15961 + ... + 18913.

It is an arithmetic number, because the mean of its divisors is an integer number (3828384).

Almost surely, 2^51491461 is an apocalyptic number.

It is an amenable number.

51491461 is a deficient number, since it is larger than the sum of its proper divisors (9762683).

51491461 is a wasteful number, since it uses less digits than its factorization.

51491461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060.

The product of its digits is 4320, while the sum is 31.

The square root of 51491461 is about 7175.7550822196. The cubic root of 51491461 is about 372.0303791624.

The spelling of 51491461 in words is "fifty-one million, four hundred ninety-one thousand, four hundred sixty-one".