71598421 has 2 divisors, whose sum is σ = 71598422. Its totient is φ = 71598420.

The previous prime is 71598391. The next prime is 71598427. The reversal of 71598421 is 12489517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70980625 + 617796 = 8425^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 71598421 - 2¹³ = 71590229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71598427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35799210 + 35799211.

It is an arithmetic number, because the mean of its divisors is an integer number (35799211).

Almost surely, 2^71598421 is an apocalyptic number.

It is an amenable number.

71598421 is a deficient number, since it is larger than the sum of its proper divisors (1).

71598421 is an equidigital number, since it uses as much as digits as its factorization.

71598421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 71598421 is about 8461.5850170048. The cubic root of 71598421 is about 415.2418796075.

The spelling of 71598421 in words is "seventy-one million, five hundred ninety-eight thousand, four hundred twenty-one".