51212098191 has 16 divisors (see below), whose sum is σ = 71888077440. Its totient is φ = 32339331360.

The previous prime is 51212098183. The next prime is 51212098199. The reversal of 51212098191 is 19189021215.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51212098183) and next prime (51212098199).

It is not a de Polignac number, because 51212098191 - 2³ = 51212098183 is a prime.

It is a super-2 number, since 2×51212098191² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51212098199) 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, 306856 + ... + 443378.

It is an arithmetic number, because the mean of its divisors is an integer number (4493004840).

Almost surely, 2^51212098191 is an apocalyptic number.

51212098191 is a deficient number, since it is larger than the sum of its proper divisors (20675979249).

51212098191 is a wasteful number, since it uses less digits than its factorization.

51212098191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143126.

The product of its (nonzero) digits is 12960, while the sum is 39.

The spelling of 51212098191 in words is "fifty-one billion, two hundred twelve million, ninety-eight thousand, one hundred ninety-one".