51890942189 has 8 divisors (see below), whose sum is σ = 53296247160. Its totient is φ = 50485787136.

The previous prime is 51890942179. The next prime is 51890942203. The reversal of 51890942189 is 98124909815.

51890942189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19658844100 + 32232098089 = 140210^2 + 179533^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51890942189 is a prime.

It is a super-2 number, since 2×51890942189² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51890942149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1332377 + ... + 1370769.

It is an arithmetic number, because the mean of its divisors is an integer number (6662030895).

Almost surely, 2^51890942189 is an apocalyptic number.

It is an amenable number.

51890942189 is a deficient number, since it is larger than the sum of its proper divisors (1405304971).

51890942189 is a wasteful number, since it uses less digits than its factorization.

51890942189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74959.

The product of its (nonzero) digits is 1866240, while the sum is 56.

The spelling of 51890942189 in words is "fifty-one billion, eight hundred ninety million, nine hundred forty-two thousand, one hundred eighty-nine".