1216525426 has 16 divisors (see below), whose sum is σ = 1921737600. Its totient is φ = 575976528.

The previous prime is 1216525399. The next prime is 1216525441. The reversal of 1216525426 is 6245256121.

It is a super-2 number, since 2×1216525426² = 2959868224208962952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1216525391 and 1216525400.

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, 90340 + ... + 102928.

It is an arithmetic number, because the mean of its divisors is an integer number (120108600).

Almost surely, 2^1216525426 is an apocalyptic number.

1216525426 is a deficient number, since it is larger than the sum of its proper divisors (705212174).

1216525426 is a wasteful number, since it uses less digits than its factorization.

1216525426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15153.

The product of its digits is 28800, while the sum is 34.

The square root of 1216525426 is about 34878.7245466344. The cubic root of 1216525426 is about 1067.5143706417.

The spelling of 1216525426 in words is "one billion, two hundred sixteen million, five hundred twenty-five thousand, four hundred twenty-six".