551215400 has 24 divisors (see below), whose sum is σ = 1281576270. Its totient is φ = 220486080.

The previous prime is 551215373. The next prime is 551215411. The reversal of 551215400 is 4512155.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 518290756 + 32924644 = 22766^2 + 5738^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1377839 + ... + 1378238.

Almost surely, 2^551215400 is an apocalyptic number.

551215400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

551215400 is an abundant number, since it is smaller than the sum of its proper divisors (730360870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551215400 is a wasteful number, since it uses less digits than its factorization.

551215400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756093 (or 2756084 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 551215400 is about 23477.9769145470. The cubic root of 551215400 is about 819.9243436048.

Adding to 551215400 its reverse (4512155), we get a palindrome (555727555).

The spelling of 551215400 in words is "five hundred fifty-one million, two hundred fifteen thousand, four hundred".