51421287154 has 8 divisors (see below), whose sum is σ = 77623217388. Its totient is φ = 25546881360.

The previous prime is 51421287037. The next prime is 51421287167. The reversal of 51421287154 is 45178212415.

It can be written as a sum of positive squares in 2 ways, for example, as 47905390129 + 3515897025 = 218873^2 + 59295^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81880717 + ... + 81881344.

Almost surely, 2^51421287154 is an apocalyptic number.

51421287154 is a deficient number, since it is larger than the sum of its proper divisors (26201930234).

51421287154 is a wasteful number, since it uses less digits than its factorization.

51421287154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163762220.

The product of its digits is 89600, while the sum is 40.

Adding to 51421287154 its reverse (45178212415), we get a palindrome (96599499569).

The spelling of 51421287154 in words is "fifty-one billion, four hundred twenty-one million, two hundred eighty-seven thousand, one hundred fifty-four".