51621043 has 8 divisors (see below), whose sum is σ = 54403920. Its totient is φ = 48844800.

The previous prime is 51621041. The next prime is 51621071. The reversal of 51621043 is 34012615.

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 51621043 - 2¹ = 51621041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51621041) 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, 29571 + ... + 31267.

It is an arithmetic number, because the mean of its divisors is an integer number (6800490).

Almost surely, 2^51621043 is an apocalyptic number.

51621043 is a deficient number, since it is larger than the sum of its proper divisors (2782877).

51621043 is a wasteful number, since it uses less digits than its factorization.

51621043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 51621043 is about 7184.7785630456. The cubic root of 51621043 is about 372.3421982232.

Adding to 51621043 its reverse (34012615), we get a palindrome (85633658).

The spelling of 51621043 in words is "fifty-one million, six hundred twenty-one thousand, forty-three".