550991951 has 8 divisors (see below), whose sum is σ = 566092800. Its totient is φ = 536031928.

The previous prime is 550991941. The next prime is 550991957. The reversal of 550991951 is 159199055.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-550991951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550991957) 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, 27251 + ... + 42948.

It is an arithmetic number, because the mean of its divisors is an integer number (70761600).

Almost surely, 2^550991951 is an apocalyptic number.

550991951 is a deficient number, since it is larger than the sum of its proper divisors (15100849).

550991951 is a wasteful number, since it uses less digits than its factorization.

550991951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70413.

The product of its (nonzero) digits is 91125, while the sum is 44.

The square root of 550991951 is about 23473.2177385206. The cubic root of 550991951 is about 819.8135363253.

The spelling of 550991951 in words is "five hundred fifty million, nine hundred ninety-one thousand, nine hundred fifty-one".