51421425 has 48 divisors (see below), whose sum is σ = 93571392. Its totient is φ = 24710400.

The previous prime is 51421417. The next prime is 51421427. The reversal of 51421425 is 52412415.

It is not a de Polignac number, because 51421425 - 2³ = 51421417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51421395 and 51421404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51421427) 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, 129327 + ... + 129723.

It is an arithmetic number, because the mean of its divisors is an integer number (1949404).

Almost surely, 2^51421425 is an apocalyptic number.

51421425 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51421425 is a deficient number, since it is larger than the sum of its proper divisors (42149967).

51421425 is a wasteful number, since it uses less digits than its factorization.

51421425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 573 counting only the distinct ones).

The product of its digits is 1600, while the sum is 24.

The square root of 51421425 is about 7170.8733777693. The cubic root of 51421425 is about 371.8616305247.

The spelling of 51421425 in words is "fifty-one million, four hundred twenty-one thousand, four hundred twenty-five".