50561551 has 4 divisors (see below), whose sum is σ = 50581872. Its totient is φ = 50541232.

The previous prime is 50561543. The next prime is 50561557. The reversal of 50561551 is 15516505.

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

It is a cyclic number.

It is not a de Polignac number, because 50561551 - 2³ = 50561543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50561557) 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, 5806 + ... + 11611.

It is an arithmetic number, because the mean of its divisors is an integer number (12645468).

Almost surely, 2^50561551 is an apocalyptic number.

50561551 is the 5806-th pentagonal number.

50561551 is a deficient number, since it is larger than the sum of its proper divisors (20321).

50561551 is a wasteful number, since it uses less digits than its factorization.

50561551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20320.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 50561551 is about 7110.6645962245. The cubic root of 50561551 is about 369.7771996851. Note that the first 3 decimals are identical.

The spelling of 50561551 in words is "fifty million, five hundred sixty-one thousand, five hundred fifty-one".