1371721154 has 4 divisors (see below), whose sum is σ = 2057581734. Its totient is φ = 685860576.

The previous prime is 1371721147. The next prime is 1371721157. The reversal of 1371721154 is 4511271731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1023040225 + 348680929 = 31985^2 + 18673^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1371721154.

It is not an unprimeable number, because it can be changed into a prime (1371721157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342930287 + ... + 342930290.

Almost surely, 2^1371721154 is an apocalyptic number.

1371721154 is a deficient number, since it is larger than the sum of its proper divisors (685860580).

1371721154 is an equidigital number, since it uses as much as digits as its factorization.

1371721154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685860579.

The product of its digits is 5880, while the sum is 32.

The square root of 1371721154 is about 37036.7540964378. The cubic root of 1371721154 is about 1111.1054522919.

Adding to 1371721154 its reverse (4511271731), we get a palindrome (5882992885).

The spelling of 1371721154 in words is "one billion, three hundred seventy-one million, seven hundred twenty-one thousand, one hundred fifty-four".