51641641 has 4 divisors (see below), whose sum is σ = 52035984. Its totient is φ = 51247300.

The previous prime is 51641633. The next prime is 51641659. The reversal of 51641641 is 14614615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51641641 - 2³ = 51641633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51641621) 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, 196975 + ... + 197236.

It is an arithmetic number, because the mean of its divisors is an integer number (13008996).

Almost surely, 2^51641641 is an apocalyptic number.

It is an amenable number.

51641641 is a deficient number, since it is larger than the sum of its proper divisors (394343).

51641641 is a wasteful number, since it uses less digits than its factorization.

51641641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394342.

The product of its digits is 2880, while the sum is 28.

The square root of 51641641 is about 7186.2118671801. The cubic root of 51641641 is about 372.3917160443.

The spelling of 51641641 in words is "fifty-one million, six hundred forty-one thousand, six hundred forty-one".