1216532426 has 16 divisors (see below), whose sum is σ = 1923345000. Its totient is φ = 576209088.

The previous prime is 1216532363. The next prime is 1216532459. The reversal of 1216532426 is 6242356121.

It can be written as a sum of positive squares in 4 ways, for example, as 1161787225 + 54745201 = 34085^2 + 7399^2 .

It is a super-2 number, since 2×1216532426² = 2959902287018890952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1216532392 and 1216532401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194801 + ... + 200948.

Almost surely, 2^1216532426 is an apocalyptic number.

1216532426 is a deficient number, since it is larger than the sum of its proper divisors (706812574).

1216532426 is a wasteful number, since it uses less digits than its factorization.

1216532426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395833.

The product of its digits is 17280, while the sum is 32.

The square root of 1216532426 is about 34878.8248941962. The cubic root of 1216532426 is about 1067.5164181633.

Adding to 1216532426 its reverse (6242356121), we get a palindrome (7458888547).

The spelling of 1216532426 in words is "one billion, two hundred sixteen million, five hundred thirty-two thousand, four hundred twenty-six".