82451421 has 12 divisors (see below), whose sum is σ = 128257948. Its totient is φ = 50739264.

The previous prime is 82451381. The next prime is 82451423. The reversal of 82451421 is 12415428.

It can be written as a sum of positive squares in 2 ways, for example, as 36360900 + 46090521 = 6030^2 + 6789^2 .

It is not a de Polignac number, because 82451421 - 2⁶ = 82451357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82451423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 352240 + ... + 352473.

Almost surely, 2^82451421 is an apocalyptic number.

It is an amenable number.

82451421 is a deficient number, since it is larger than the sum of its proper divisors (45806527).

82451421 is a wasteful number, since it uses less digits than its factorization.

82451421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704732 (or 704729 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 82451421 is about 9080.2764825747. The cubic root of 82451421 is about 435.2439218580.

Adding to 82451421 its reverse (12415428), we get a palindrome (94866849).

The spelling of 82451421 in words is "eighty-two million, four hundred fifty-one thousand, four hundred twenty-one".