51191970 has 16 divisors (see below), whose sum is σ = 122860800. Its totient is φ = 13651184.

The previous prime is 51191963. The next prime is 51191971. The reversal of 51191970 is 7919115.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51191971) 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, 853170 + ... + 853229.

It is an arithmetic number, because the mean of its divisors is an integer number (7678800).

Almost surely, 2^51191970 is an apocalyptic number.

51191970 is an abundant number, since it is smaller than the sum of its proper divisors (71668830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51191970 is a wasteful number, since it uses less digits than its factorization.

51191970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706409.

The product of its (nonzero) digits is 2835, while the sum is 33.

The square root of 51191970 is about 7154.8563926888. The cubic root of 51191970 is about 371.3076931958.

The spelling of 51191970 in words is "fifty-one million, one hundred ninety-one thousand, nine hundred seventy".