1216050757 has 4 divisors (see below), whose sum is σ = 1216811916. Its totient is φ = 1215289600.

The previous prime is 1216050751. The next prime is 1216050767. The reversal of 1216050757 is 7570506121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 768897441 + 447153316 = 27729^2 + 21146^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216050757 - 2²³ = 1207662149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216050751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378178 + ... + 381379.

It is an arithmetic number, because the mean of its divisors is an integer number (304202979).

Almost surely, 2^1216050757 is an apocalyptic number.

It is an amenable number.

1216050757 is a deficient number, since it is larger than the sum of its proper divisors (761159).

1216050757 is an equidigital number, since it uses as much as digits as its factorization.

1216050757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761158.

The product of its (nonzero) digits is 14700, while the sum is 34.

The square root of 1216050757 is about 34871.9193191313. The cubic root of 1216050757 is about 1067.3755101662.

Adding to 1216050757 its reverse (7570506121), we get a palindrome (8786556878).

The spelling of 1216050757 in words is "one billion, two hundred sixteen million, fifty thousand, seven hundred fifty-seven".