51621458 has 8 divisors (see below), whose sum is σ = 88493952. Its totient is φ = 22123476.

The previous prime is 51621431. The next prime is 51621491. The reversal of 51621458 is 85412615.

51621458 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1843610 + ... + 1843637.

It is an arithmetic number, because the mean of its divisors is an integer number (11061744).

Almost surely, 2^51621458 is an apocalyptic number.

51621458 is a deficient number, since it is larger than the sum of its proper divisors (36872494).

51621458 is a wasteful number, since it uses less digits than its factorization.

51621458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3687256.

The product of its digits is 9600, while the sum is 32.

The square root of 51621458 is about 7184.8074434880. The cubic root of 51621458 is about 372.3431960178.

The spelling of 51621458 in words is "fifty-one million, six hundred twenty-one thousand, four hundred fifty-eight".