51571591 has 8 divisors (see below), whose sum is σ = 54673920. Its totient is φ = 48476928.

The previous prime is 51571579. The next prime is 51571607. The reversal of 51571591 is 19517515.

It is a happy number.

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

It is not a de Polignac number, because 51571591 - 2⁷ = 51571463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51571391) 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, 17850 + ... + 20536.

It is an arithmetic number, because the mean of its divisors is an integer number (6834240).

Almost surely, 2^51571591 is an apocalyptic number.

51571591 is a deficient number, since it is larger than the sum of its proper divisors (3102329).

51571591 is a wasteful number, since it uses less digits than its factorization.

51571591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3833.

The product of its digits is 7875, while the sum is 34.

The square root of 51571591 is about 7181.3362962613. The cubic root of 51571591 is about 372.2232612662.

The spelling of 51571591 in words is "fifty-one million, five hundred seventy-one thousand, five hundred ninety-one".