51561355 has 8 divisors (see below), whose sum is σ = 62319600. Its totient is φ = 40951776.

The previous prime is 51561353. The next prime is 51561359. The reversal of 51561355 is 55316515.

51561355 = T₂₇₄ + T₂₇₅ + ... + T₆₉₀.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51561355 - 2¹ = 51561353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51561353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36400 + ... + 37789.

It is an arithmetic number, because the mean of its divisors is an integer number (7789950).

Almost surely, 2^51561355 is an apocalyptic number.

51561355 is a deficient number, since it is larger than the sum of its proper divisors (10758245).

51561355 is a wasteful number, since it uses less digits than its factorization.

51561355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74333.

The product of its digits is 11250, while the sum is 31.

The square root of 51561355 is about 7180.6235801635. The cubic root of 51561355 is about 372.1986331759.

The spelling of 51561355 in words is "fifty-one million, five hundred sixty-one thousand, three hundred fifty-five".