51609973 has 2 divisors, whose sum is σ = 51609974. Its totient is φ = 51609972.

The previous prime is 51609923. The next prime is 51609979. The reversal of 51609973 is 37990615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39652209 + 11957764 = 6297^2 + 3458^2 .

It is a cyclic number.

It is not a de Polignac number, because 51609973 - 2⁹ = 51609461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51609979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25804986 + 25804987.

It is an arithmetic number, because the mean of its divisors is an integer number (25804987).

Almost surely, 2^51609973 is an apocalyptic number.

It is an amenable number.

51609973 is a deficient number, since it is larger than the sum of its proper divisors (1).

51609973 is an equidigital number, since it uses as much as digits as its factorization.

51609973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 51609973 is about 7184.0081430912. The cubic root of 51609973 is about 372.3155803779.

The spelling of 51609973 in words is "fifty-one million, six hundred nine thousand, nine hundred seventy-three".