51111242001 has 16 divisors (see below), whose sum is σ = 76470069120. Its totient is φ = 33736791600.

The previous prime is 51111241981. The next prime is 51111242023. The reversal of 51111242001 is 10024211115.

51111242001 is a `hidden beast` number, since 511 + 112 + 42 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 51111242001 - 2¹³ = 51111233809 is a prime.

It is a super-2 number, since 2×51111242001² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51111242041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9368605 + ... + 9374058.

It is an arithmetic number, because the mean of its divisors is an integer number (4779379320).

Almost surely, 2^51111242001 is an apocalyptic number.

It is an amenable number.

51111242001 is a deficient number, since it is larger than the sum of its proper divisors (25358827119).

51111242001 is a wasteful number, since it uses less digits than its factorization.

51111242001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18742773 (or 18742767 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 51111242001 its reverse (10024211115), we get a palindrome (61135453116).

The spelling of 51111242001 in words is "fifty-one billion, one hundred eleven million, two hundred forty-two thousand, one".