51129825 has 12 divisors (see below), whose sum is σ = 84534768. Its totient is φ = 27269200.

The previous prime is 51129811. The next prime is 51129839. The reversal of 51129825 is 52892115.

It is an interprime number because it is at equal distance from previous prime (51129811) and next prime (51129839).

It is not a de Polignac number, because 51129825 - 2⁴ = 51129809 is a prime.

It is a super-2 number, since 2×51129825² = 5228518009061250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 340791 + ... + 340940.

It is an arithmetic number, because the mean of its divisors is an integer number (7044564).

Almost surely, 2^51129825 is an apocalyptic number.

It is an amenable number.

51129825 is a deficient number, since it is larger than the sum of its proper divisors (33404943).

51129825 is a wasteful number, since it uses less digits than its factorization.

51129825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681744 (or 681739 counting only the distinct ones).

The product of its digits is 7200, while the sum is 33.

The square root of 51129825 is about 7150.5122194148. The cubic root of 51129825 is about 371.1573814689.

The spelling of 51129825 in words is "fifty-one million, one hundred twenty-nine thousand, eight hundred twenty-five".