15382113781 has 4 divisors (see below), whose sum is σ = 15389572032. Its totient is φ = 15374655532.

The previous prime is 15382113767. The next prime is 15382113809. The reversal of 15382113781 is 18731128351.

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.

It is a cyclic number.

It is not a de Polignac number, because 15382113781 - 2⁵ = 15382113749 is a prime.

It is a super-2 number, since 2×15382113781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15382113731) 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, 3726031 + ... + 3730156.

It is an arithmetic number, because the mean of its divisors is an integer number (3847393008).

Almost surely, 2^15382113781 is an apocalyptic number.

It is an amenable number.

15382113781 is a deficient number, since it is larger than the sum of its proper divisors (7458251).

15382113781 is an equidigital number, since it uses as much as digits as its factorization.

15382113781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7458250.

The product of its digits is 40320, while the sum is 40.

The spelling of 15382113781 in words is "fifteen billion, three hundred eighty-two million, one hundred thirteen thousand, seven hundred eighty-one".