551621938 has 16 divisors (see below), whose sum is σ = 947802240. Its totient is φ = 235868256.

The previous prime is 551621909. The next prime is 551621951. The reversal of 551621938 is 839126155.

It is a self number, because there is not a number n which added to its sum of digits gives 551621938.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38731 + ... + 51022.

It is an arithmetic number, because the mean of its divisors is an integer number (59237640).

Almost surely, 2^551621938 is an apocalyptic number.

551621938 is a deficient number, since it is larger than the sum of its proper divisors (396180302).

551621938 is a wasteful number, since it uses less digits than its factorization.

551621938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90201.

The product of its digits is 64800, while the sum is 40.

The square root of 551621938 is about 23486.6331771925. The cubic root of 551621938 is about 820.1258670560.

The spelling of 551621938 in words is "five hundred fifty-one million, six hundred twenty-one thousand, nine hundred thirty-eight".