51661061 has 4 divisors (see below), whose sum is σ = 52635852. Its totient is φ = 50686272.

The previous prime is 51661003. The next prime is 51661063. The reversal of 51661061 is 16016615.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15288100 + 36372961 = 3910^2 + 6031^2 .

It is a cyclic number.

It is not a de Polignac number, because 51661061 - 2¹⁸ = 51398917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51661061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51661063) 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, 487316 + ... + 487421.

It is an arithmetic number, because the mean of its divisors is an integer number (13158963).

Almost surely, 2^51661061 is an apocalyptic number.

It is an amenable number.

51661061 is a deficient number, since it is larger than the sum of its proper divisors (974791).

51661061 is an equidigital number, since it uses as much as digits as its factorization.

51661061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974790.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 51661061 is about 7187.5629388549. The cubic root of 51661061 is about 372.4383898825.

Adding to 51661061 its reverse (16016615), we get a palindrome (67677676).

The spelling of 51661061 in words is "fifty-one million, six hundred sixty-one thousand, sixty-one".