51142247 has 8 divisors (see below), whose sum is σ = 55408416. Its totient is φ = 46923552.

The previous prime is 51142241. The next prime is 51142277. The reversal of 51142247 is 74224115.

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

It is not a de Polignac number, because 51142247 - 2¹⁸ = 50880103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51142241) 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, 9608 + ... + 13949.

It is an arithmetic number, because the mean of its divisors is an integer number (6926052).

Almost surely, 2^51142247 is an apocalyptic number.

51142247 is a deficient number, since it is larger than the sum of its proper divisors (4266169).

51142247 is a wasteful number, since it uses less digits than its factorization.

51142247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23737.

The product of its digits is 2240, while the sum is 26.

The square root of 51142247 is about 7151.3807757663. The cubic root of 51142247 is about 371.1874366188.

The spelling of 51142247 in words is "fifty-one million, one hundred forty-two thousand, two hundred forty-seven".