1216161046 has 4 divisors (see below), whose sum is σ = 1824241572. Its totient is φ = 608080522.

The previous prime is 1216161007. The next prime is 1216161047. The reversal of 1216161046 is 6401616121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6401616121 = 3347 ⋅1912643.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216161047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304040260 + ... + 304040263.

It is an arithmetic number, because the mean of its divisors is an integer number (456060393).

Almost surely, 2^1216161046 is an apocalyptic number.

1216161046 is a deficient number, since it is larger than the sum of its proper divisors (608080526).

1216161046 is an equidigital number, since it uses as much as digits as its factorization.

1216161046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608080525.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1216161046 is about 34873.5006272671. The cubic root of 1216161046 is about 1067.4077775197.

Adding to 1216161046 its reverse (6401616121), we get a palindrome (7617777167).

The spelling of 1216161046 in words is "one billion, two hundred sixteen million, one hundred sixty-one thousand, forty-six".