1371721047 has 8 divisors (see below), whose sum is σ = 1838246256. Its totient is φ = 909838272.

The previous prime is 1371721009. The next prime is 1371721049. The reversal of 1371721047 is 7401271731.

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

It is not a de Polignac number, because 1371721047 - 2⁶ = 1371720983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1371720999 and 1371721017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1371721049) 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, 1159918 + ... + 1161099.

It is an arithmetic number, because the mean of its divisors is an integer number (229780782).

Almost surely, 2^1371721047 is an apocalyptic number.

1371721047 is a deficient number, since it is larger than the sum of its proper divisors (466525209).

1371721047 is a wasteful number, since it uses less digits than its factorization.

1371721047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321217.

The product of its (nonzero) digits is 8232, while the sum is 33.

The square root of 1371721047 is about 37036.7526519267. The cubic root of 1371721047 is about 1111.1054234016.

Adding to 1371721047 its reverse (7401271731), we get a palindrome (8772992778).

The spelling of 1371721047 in words is "one billion, three hundred seventy-one million, seven hundred twenty-one thousand, forty-seven".