97555421 has 4 divisors (see below), whose sum is σ = 100192092. Its totient is φ = 94918752.

The previous prime is 97555411. The next prime is 97555427. The reversal of 97555421 is 12455579.

It is a happy number.

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 36168196 + 61387225 = 6014^2 + 7835^2 .

It is a cyclic number.

It is not a de Polignac number, because 97555421 - 2¹⁸ = 97293277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97555427) 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, 1318280 + ... + 1318353.

It is an arithmetic number, because the mean of its divisors is an integer number (25048023).

Almost surely, 2^97555421 is an apocalyptic number.

It is an amenable number.

97555421 is a deficient number, since it is larger than the sum of its proper divisors (2636671).

97555421 is a wasteful number, since it uses less digits than its factorization.

97555421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636670.

The product of its digits is 63000, while the sum is 38.

The square root of 97555421 is about 9877.0147818053. The cubic root of 97555421 is about 460.3453943425.

The spelling of 97555421 in words is "ninety-seven million, five hundred fifty-five thousand, four hundred twenty-one".