51001120172 has 6 divisors (see below), whose sum is σ = 89251960308. Its totient is φ = 25500560084.

The previous prime is 51001120171. The next prime is 51001120189. The reversal of 51001120172 is 27102110015.

It is a happy number.

It is a super-2 number, since 2×51001120172² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51001120171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6375140018 + ... + 6375140025.

It is an arithmetic number, because the mean of its divisors is an integer number (14875326718).

Almost surely, 2^51001120172 is an apocalyptic number.

It is an amenable number.

51001120172 is a deficient number, since it is larger than the sum of its proper divisors (38250840136).

51001120172 is a wasteful number, since it uses less digits than its factorization.

51001120172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12750280047 (or 12750280045 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 20.

Adding to 51001120172 its reverse (27102110015), we get a palindrome (78103230187).

The spelling of 51001120172 in words is "fifty-one billion, one million, one hundred twenty thousand, one hundred seventy-two".