15143961394 has 4 divisors (see below), whose sum is σ = 22715942094. Its totient is φ = 7571980696.

The previous prime is 15143961383. The next prime is 15143961397. The reversal of 15143961394 is 49316934151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49316934151 = 733 ⋅67280947.

It can be written as a sum of positive squares in only one way, i.e., 13031364025 + 2112597369 = 114155^2 + 45963^2 .

It is not an unprimeable number, because it can be changed into a prime (15143961397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3785990347 + ... + 3785990350.

Almost surely, 2^15143961394 is an apocalyptic number.

15143961394 is a deficient number, since it is larger than the sum of its proper divisors (7571980700).

15143961394 is an equidigital number, since it uses as much as digits as its factorization.

15143961394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7571980699.

The product of its digits is 349920, while the sum is 46.

The spelling of 15143961394 in words is "fifteen billion, one hundred forty-three million, nine hundred sixty-one thousand, three hundred ninety-four".