1216025511 has 8 divisors (see below), whose sum is σ = 1622499840. Its totient is φ = 810117432.

The previous prime is 1216025429. The next prime is 1216025543. The reversal of 1216025511 is 1155206121.

1216025511 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216025511 - 2¹⁹ = 1215501223 is a prime.

It is a super-2 number, since 2×1216025511² = 2957436086805622242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216029511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136525 + ... + 145158.

It is an arithmetic number, because the mean of its divisors is an integer number (202812480).

Almost surely, 2^1216025511 is an apocalyptic number.

1216025511 is a deficient number, since it is larger than the sum of its proper divisors (406474329).

1216025511 is a wasteful number, since it uses less digits than its factorization.

1216025511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283125.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 1216025511 is about 34871.5573354561. The cubic root of 1216025511 is about 1067.3681236465.

The spelling of 1216025511 in words is "one billion, two hundred sixteen million, twenty-five thousand, five hundred eleven".