51240145 has 8 divisors (see below), whose sum is σ = 67078080. Its totient is φ = 37265520.

The previous prime is 51240121. The next prime is 51240221. The reversal of 51240145 is 54104215.

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

It is not a de Polignac number, because 51240145 - 2¹⁷ = 51109073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465765 + ... + 465874.

It is an arithmetic number, because the mean of its divisors is an integer number (8384760).

Almost surely, 2^51240145 is an apocalyptic number.

51240145 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51240145 is a deficient number, since it is larger than the sum of its proper divisors (15837935).

51240145 is a wasteful number, since it uses less digits than its factorization.

51240145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931655.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 51240145 is about 7158.2221954896. Note that the first 3 decimals coincide. The cubic root of 51240145 is about 371.4241316390.

The spelling of 51240145 in words is "fifty-one million, two hundred forty thousand, one hundred forty-five".