51020198 has 4 divisors (see below), whose sum is σ = 76530300. Its totient is φ = 25510098.

The previous prime is 51020197. The next prime is 51020201. The reversal of 51020198 is 89102015.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51020197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12755048 + ... + 12755051.

It is an arithmetic number, because the mean of its divisors is an integer number (19132575).

Almost surely, 2^51020198 is an apocalyptic number.

51020198 is a deficient number, since it is larger than the sum of its proper divisors (25510102).

51020198 is a wasteful number, since it uses less digits than its factorization.

51020198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25510101.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 51020198 is about 7142.8424314134. The cubic root of 51020198 is about 370.8919265858.

The spelling of 51020198 in words is "fifty-one million, twenty thousand, one hundred ninety-eight".