51621067 has 4 divisors (see below), whose sum is σ = 52467376. Its totient is φ = 50774760.

The previous prime is 51621041. The next prime is 51621071. The reversal of 51621067 is 76012615.

51621067 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51621067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51621007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423063 + ... + 423184.

It is an arithmetic number, because the mean of its divisors is an integer number (13116844).

Almost surely, 2^51621067 is an apocalyptic number.

51621067 is a deficient number, since it is larger than the sum of its proper divisors (846309).

51621067 is an equidigital number, since it uses as much as digits as its factorization.

51621067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846308.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 51621067 is about 7184.7802332430. The cubic root of 51621067 is about 372.3422559271.

The spelling of 51621067 in words is "fifty-one million, six hundred twenty-one thousand, sixty-seven".