51145245 has 48 divisors (see below), whose sum is σ = 95659200. Its totient is φ = 25194240.

The previous prime is 51145229. The next prime is 51145249. The reversal of 51145245 is 54254115.

It is not a de Polignac number, because 51145245 - 2⁴ = 51145229 is a prime.

It is a super-2 number, since 2×51145245² = 5231672172220050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51145249) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34326 + ... + 35784.

It is an arithmetic number, because the mean of its divisors is an integer number (1992900).

Almost surely, 2^51145245 is an apocalyptic number.

It is an amenable number.

51145245 is a deficient number, since it is larger than the sum of its proper divisors (44513955).

51145245 is a wasteful number, since it uses less digits than its factorization.

51145245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530 (or 1527 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 51145245 is about 7151.5903825653. The cubic root of 51145245 is about 371.1946895800.

The spelling of 51145245 in words is "fifty-one million, one hundred forty-five thousand, two hundred forty-five".