51248769 has 32 divisors (see below), whose sum is σ = 81521664. Its totient is φ = 28226880.

The previous prime is 51248767. The next prime is 51248831. The reversal of 51248769 is 96784215.

It is not a de Polignac number, because 51248769 - 2¹ = 51248767 is a prime.

It is a super-2 number, since 2×51248769² = 5252872648030722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51248769.

It is not an unprimeable number, because it can be changed into a prime (51248767) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27852 + ... + 29634.

It is an arithmetic number, because the mean of its divisors is an integer number (2547552).

Almost surely, 2^51248769 is an apocalyptic number.

It is an amenable number.

51248769 is a deficient number, since it is larger than the sum of its proper divisors (30272895).

51248769 is a wasteful number, since it uses less digits than its factorization.

51248769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877.

The product of its digits is 120960, while the sum is 42.

The square root of 51248769 is about 7158.8245543525. The cubic root of 51248769 is about 371.4449680491. Note that the first 3 decimals are identical.

The spelling of 51248769 in words is "fifty-one million, two hundred forty-eight thousand, seven hundred sixty-nine".