51421087 has 8 divisors (see below), whose sum is σ = 54488960. Its totient is φ = 48389400.

The previous prime is 51421081. The next prime is 51421091. The reversal of 51421087 is 78012415.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51421087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51421081) 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, 6093 + ... + 11830.

It is an arithmetic number, because the mean of its divisors is an integer number (6811120).

Almost surely, 2^51421087 is an apocalyptic number.

51421087 is a deficient number, since it is larger than the sum of its proper divisors (3067873).

51421087 is a wasteful number, since it uses less digits than its factorization.

51421087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18093.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 51421087 is about 7170.8498101689. The cubic root of 51421087 is about 371.8608157573.

The spelling of 51421087 in words is "fifty-one million, four hundred twenty-one thousand, eighty-seven".