1554550421 has 4 divisors (see below), whose sum is σ = 1570576812. Its totient is φ = 1538524032.

The previous prime is 1554550411. The next prime is 1554550429. The reversal of 1554550421 is 1240554551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1153349521 + 401200900 = 33961^2 + 20030^2 .

It is a cyclic number.

It is not a de Polignac number, because 1554550421 - 2²² = 1550356117 is a prime.

It is a super-4 number, since 4×1554550421⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1554550429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8013050 + ... + 8013243.

It is an arithmetic number, because the mean of its divisors is an integer number (392644203).

Almost surely, 2^1554550421 is an apocalyptic number.

It is an amenable number.

1554550421 is a deficient number, since it is larger than the sum of its proper divisors (16026391).

1554550421 is an equidigital number, since it uses as much as digits as its factorization.

1554550421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16026390.

The product of its (nonzero) digits is 20000, while the sum is 32.

The square root of 1554550421 is about 39427.7874220707. The cubic root of 1554550421 is about 1158.4259320599.

The spelling of 1554550421 in words is "one billion, five hundred fifty-four million, five hundred fifty thousand, four hundred twenty-one".