51421086 has 24 divisors (see below), whose sum is σ = 111627984. Its totient is φ = 17107200.

The previous prime is 51421081. The next prime is 51421091. The reversal of 51421086 is 68012415.

It is an interprime number because it is at equal distance from previous prime (51421081) and next prime (51421091).

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 11 ways as a sum of consecutive naturals, for example, 7911 + ... + 12861.

It is an arithmetic number, because the mean of its divisors is an integer number (4651166).

Almost surely, 2^51421086 is an apocalyptic number.

51421086 is an abundant number, since it is smaller than the sum of its proper divisors (60206898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51421086 is a wasteful number, since it uses less digits than its factorization.

51421086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5536 (or 5533 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 51421086 is about 7170.8497404422. The cubic root of 51421086 is about 371.8608133467.

The spelling of 51421086 in words is "fifty-one million, four hundred twenty-one thousand, eighty-six".