51621927 has 16 divisors (see below), whose sum is σ = 78799872. Its totient is φ = 29446560.

The previous prime is 51621923. The next prime is 51621929. The reversal of 51621927 is 72912615.

It is not a de Polignac number, because 51621927 - 2² = 51621923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12402 + ... + 16032.

It is an arithmetic number, because the mean of its divisors is an integer number (4924992).

Almost surely, 2^51621927 is an apocalyptic number.

51621927 is a deficient number, since it is larger than the sum of its proper divisors (27177945).

51621927 is a wasteful number, since it uses less digits than its factorization.

51621927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4318.

The product of its digits is 7560, while the sum is 33.

The square root of 51621927 is about 7184.8400817276. The cubic root of 51621927 is about 372.3443236395.

The spelling of 51621927 in words is "fifty-one million, six hundred twenty-one thousand, nine hundred twenty-seven".