51621153 has 8 divisors (see below), whose sum is σ = 68913600. Its totient is φ = 34371408.

The previous prime is 51621137. The next prime is 51621161. The reversal of 51621153 is 35112615.

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

It is not a de Polignac number, because 51621153 - 2⁴ = 51621137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51621133) 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, 7738 + ... + 12771.

It is an arithmetic number, because the mean of its divisors is an integer number (8614200).

Almost surely, 2^51621153 is an apocalyptic number.

It is an amenable number.

51621153 is a deficient number, since it is larger than the sum of its proper divisors (17292447).

51621153 is a wasteful number, since it uses less digits than its factorization.

51621153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21351.

The product of its digits is 900, while the sum is 24.

The square root of 51621153 is about 7184.7862181139. The cubic root of 51621153 is about 372.3424626994.

Adding to 51621153 its reverse (35112615), we get a palindrome (86733768).

The spelling of 51621153 in words is "fifty-one million, six hundred twenty-one thousand, one hundred fifty-three".