51421429 has 4 divisors (see below), whose sum is σ = 54127840. Its totient is φ = 48715020.

The previous prime is 51421427. The next prime is 51421439. The reversal of 51421429 is 92412415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51421429 - 2¹ = 51421427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51421397 and 51421406.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1353177 + ... + 1353214.

It is an arithmetic number, because the mean of its divisors is an integer number (13531960).

Almost surely, 2^51421429 is an apocalyptic number.

It is an amenable number.

51421429 is a deficient number, since it is larger than the sum of its proper divisors (2706411).

51421429 is a wasteful number, since it uses less digits than its factorization.

51421429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2706410.

The product of its digits is 2880, while the sum is 28.

The square root of 51421429 is about 7170.8736566753. The cubic root of 51421429 is about 371.8616401669.

The spelling of 51421429 in words is "fifty-one million, four hundred twenty-one thousand, four hundred twenty-nine".