51154650491 has 12 divisors (see below), whose sum is σ = 59605476840. Its totient is φ = 43773861600.

The previous prime is 51154650473. The next prime is 51154650499. The reversal of 51154650491 is 19405645115.

It is not a de Polignac number, because 51154650491 - 2¹⁴ = 51154634107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51154650499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 839081 + ... + 897978.

It is an arithmetic number, because the mean of its divisors is an integer number (4967123070).

Almost surely, 2^51154650491 is an apocalyptic number.

51154650491 is a deficient number, since it is larger than the sum of its proper divisors (8450826349).

51154650491 is a wasteful number, since it uses less digits than its factorization.

51154650491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737674 (or 1737667 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 51154650491 in words is "fifty-one billion, one hundred fifty-four million, six hundred fifty thousand, four hundred ninety-one".