871554421 has 2 divisors, whose sum is σ = 871554422. Its totient is φ = 871554420.

The previous prime is 871554413. The next prime is 871554427. The reversal of 871554421 is 124455178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 572644900 + 298909521 = 23930^2 + 17289^2 .

It is a cyclic number.

It is not a de Polignac number, because 871554421 - 2³ = 871554413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871554427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435777210 + 435777211.

It is an arithmetic number, because the mean of its divisors is an integer number (435777211).

Almost surely, 2^871554421 is an apocalyptic number.

It is an amenable number.

871554421 is a deficient number, since it is larger than the sum of its proper divisors (1).

871554421 is an equidigital number, since it uses as much as digits as its factorization.

871554421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44800, while the sum is 37.

The square root of 871554421 is about 29522.1005519594. The cubic root of 871554421 is about 955.2084816625.

It can be divided in two parts, 8715 and 54421, that added together give a palindrome (63136).

The spelling of 871554421 in words is "eight hundred seventy-one million, five hundred fifty-four thousand, four hundred twenty-one".