71862421 has 2 divisors, whose sum is σ = 71862422. Its totient is φ = 71862420.

The previous prime is 71862407. The next prime is 71862431. The reversal of 71862421 is 12426817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47803396 + 24059025 = 6914^2 + 4905^2 .

It is a cyclic number.

It is not a de Polignac number, because 71862421 - 2¹⁹ = 71338133 is a prime.

It is a super-3 number, since 3×71862421³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71862431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35931210 + 35931211.

It is an arithmetic number, because the mean of its divisors is an integer number (35931211).

Almost surely, 2^71862421 is an apocalyptic number.

It is an amenable number.

71862421 is a deficient number, since it is larger than the sum of its proper divisors (1).

71862421 is an equidigital number, since it uses as much as digits as its factorization.

71862421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

The square root of 71862421 is about 8477.1705774981. The cubic root of 71862421 is about 415.7516180152.

The spelling of 71862421 in words is "seventy-one million, eight hundred sixty-two thousand, four hundred twenty-one".