51581541 has 8 divisors (see below), whose sum is σ = 75027744. Its totient is φ = 31261520.

The previous prime is 51581533. The next prime is 51581573. The reversal of 51581541 is 14518515.

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

It is a cyclic number.

It is not a de Polignac number, because 51581541 - 2³ = 51581533 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51581499 and 51581508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51581501) 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 7 ways as a sum of consecutive naturals, for example, 781506 + ... + 781571.

It is an arithmetic number, because the mean of its divisors is an integer number (9378468).

Almost surely, 2^51581541 is an apocalyptic number.

It is an amenable number.

51581541 is a deficient number, since it is larger than the sum of its proper divisors (23446203).

51581541 is a wasteful number, since it uses less digits than its factorization.

51581541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563091.

The product of its digits is 4000, while the sum is 30.

The square root of 51581541 is about 7182.0290308519. The cubic root of 51581541 is about 372.2471981096.

The spelling of 51581541 in words is "fifty-one million, five hundred eighty-one thousand, five hundred forty-one".