51945190 has 32 divisors (see below), whose sum is σ = 102604320. Its totient is φ = 18777600.

The previous prime is 51945143. The next prime is 51945191. The reversal of 51945190 is 9154915.

It is a happy number.

It is a super-2 number, since 2×51945190² = 5396605528272200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51945191) 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, 18606 + ... + 21214.

It is an arithmetic number, because the mean of its divisors is an integer number (3206385).

Almost surely, 2^51945190 is an apocalyptic number.

51945190 is a deficient number, since it is larger than the sum of its proper divisors (50659130).

51945190 is a wasteful number, since it uses less digits than its factorization.

51945190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 51945190 is about 7207.3011592412. The cubic root of 51945190 is about 373.1199292352.

The spelling of 51945190 in words is "fifty-one million, nine hundred forty-five thousand, one hundred ninety".