1416136721 has 4 divisors (see below), whose sum is σ = 1416222192. Its totient is φ = 1416051252.

The previous prime is 1416136717. The next prime is 1416136727. The reversal of 1416136721 is 1276316141.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1276316141 = 193 ⋅6613037.

It is a cyclic number.

It is not a de Polignac number, because 1416136721 - 2² = 1416136717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1416136727) 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, 9011 + ... + 53976.

It is an arithmetic number, because the mean of its divisors is an integer number (354055548).

Almost surely, 2^1416136721 is an apocalyptic number.

It is an amenable number.

1416136721 is a deficient number, since it is larger than the sum of its proper divisors (85471).

1416136721 is an equidigital number, since it uses as much as digits as its factorization.

1416136721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85470.

The product of its digits is 6048, while the sum is 32.

The square root of 1416136721 is about 37631.5920603952. The cubic root of 1416136721 is about 1122.9706218508.

The spelling of 1416136721 in words is "one billion, four hundred sixteen million, one hundred thirty-six thousand, seven hundred twenty-one".