551900402 has 4 divisors (see below), whose sum is σ = 827850606. Its totient is φ = 275950200.

The previous prime is 551900381. The next prime is 551900411. The reversal of 551900402 is 204009155.

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

It can be written as a sum of positive squares in only one way, i.e., 551733121 + 167281 = 23489^2 + 409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137975099 + ... + 137975102.

Almost surely, 2^551900402 is an apocalyptic number.

551900402 is a deficient number, since it is larger than the sum of its proper divisors (275950204).

551900402 is a wasteful number, since it uses less digits than its factorization.

551900402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275950203.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 551900402 is about 23492.5605671242. The cubic root of 551900402 is about 820.2638462865.

Adding to 551900402 its reverse (204009155), we get a palindrome (755909557).

The spelling of 551900402 in words is "five hundred fifty-one million, nine hundred thousand, four hundred two".