551401623 has 6 divisors (see below), whose sum is σ = 796469024. Its totient is φ = 367601076.

The previous prime is 551401601. The next prime is 551401633. The reversal of 551401623 is 326104155.

It is not a de Polignac number, because 551401623 - 2⁹ = 551401111 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 (551401633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30633415 + ... + 30633432.

Almost surely, 2^551401623 is an apocalyptic number.

551401623 is a deficient number, since it is larger than the sum of its proper divisors (245067401).

551401623 is a wasteful number, since it uses less digits than its factorization.

551401623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61266853 (or 61266850 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 551401623 is about 23481.9424877926. The cubic root of 551401623 is about 820.0166678151.

Adding to 551401623 its reverse (326104155), we get a palindrome (877505778).

The spelling of 551401623 in words is "five hundred fifty-one million, four hundred one thousand, six hundred twenty-three".