51641605 has 12 divisors (see below), whose sum is σ = 64185732. Its totient is φ = 39885440.

The previous prime is 51641549. The next prime is 51641621. The reversal of 51641605 is 50614615.

It can be written as a sum of positive squares in 6 ways, for example, as 1387684 + 50253921 = 1178^2 + 7089^2 .

It is not a de Polignac number, because 51641605 - 2¹⁷ = 51510533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1936 + ... + 10345.

It is an arithmetic number, because the mean of its divisors is an integer number (5348811).

Almost surely, 2^51641605 is an apocalyptic number.

It is an amenable number.

51641605 is a deficient number, since it is larger than the sum of its proper divisors (12544127).

51641605 is a wasteful number, since it uses less digits than its factorization.

51641605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12344 (or 12315 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51641605 is about 7186.2093623829. The cubic root of 51641605 is about 372.3916295114.

The spelling of 51641605 in words is "fifty-one million, six hundred forty-one thousand, six hundred five".