1216323701 has 4 divisors (see below), whose sum is σ = 1287872172. Its totient is φ = 1144775232.

The previous prime is 1216323679. The next prime is 1216323761. The reversal of 1216323701 is 1073236121.

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 1093889476 + 122434225 = 33074^2 + 11065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216323701 - 2¹⁴ = 1216307317 is a prime.

It is a super-2 number, since 2×1216323701² = 2958886691228674802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216323761) 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, 35774210 + ... + 35774243.

It is an arithmetic number, because the mean of its divisors is an integer number (321968043).

Almost surely, 2^1216323701 is an apocalyptic number.

It is an amenable number.

1216323701 is a deficient number, since it is larger than the sum of its proper divisors (71548471).

1216323701 is an equidigital number, since it uses as much as digits as its factorization.

1216323701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71548470.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1216323701 is about 34875.8326208852. The cubic root of 1216323701 is about 1067.4553620818.

Adding to 1216323701 its reverse (1073236121), we get a palindrome (2289559822).

The spelling of 1216323701 in words is "one billion, two hundred sixteen million, three hundred twenty-three thousand, seven hundred one".