51621459 has 4 divisors (see below), whose sum is σ = 68828616. Its totient is φ = 34414304.

The previous prime is 51621431. The next prime is 51621491. The reversal of 51621459 is 95412615.

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

It is a cyclic number.

It is not a de Polignac number, because 51621459 - 2¹³ = 51613267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51621359) 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, 8603574 + ... + 8603579.

It is an arithmetic number, because the mean of its divisors is an integer number (17207154).

Almost surely, 2^51621459 is an apocalyptic number.

51621459 is a deficient number, since it is larger than the sum of its proper divisors (17207157).

51621459 is a wasteful number, since it uses less digits than its factorization.

51621459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17207156.

The product of its digits is 10800, while the sum is 33.

The square root of 51621459 is about 7184.8075130792. The cubic root of 51621459 is about 372.3431984221.

The spelling of 51621459 in words is "fifty-one million, six hundred twenty-one thousand, four hundred fifty-nine".