1361291721 has 8 divisors (see below), whose sum is σ = 1857266400. Its totient is φ = 886422432.

The previous prime is 1361291699. The next prime is 1361291759. The reversal of 1361291721 is 1271921631.

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

It is not a de Polignac number, because 1361291721 - 2¹¹ = 1361289673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1361291021) 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, 5276196 + ... + 5276453.

It is an arithmetic number, because the mean of its divisors is an integer number (232158300).

Almost surely, 2^1361291721 is an apocalyptic number.

It is an amenable number.

1361291721 is a deficient number, since it is larger than the sum of its proper divisors (495974679).

1361291721 is a wasteful number, since it uses less digits than its factorization.

1361291721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10552695.

The product of its digits is 4536, while the sum is 33.

The square root of 1361291721 is about 36895.6870243664. The cubic root of 1361291721 is about 1108.2823096165.

The spelling of 1361291721 in words is "one billion, three hundred sixty-one million, two hundred ninety-one thousand, seven hundred twenty-one".