11378432981 has 4 divisors (see below), whose sum is σ = 11379607500. Its totient is φ = 11377258464.

The previous prime is 11378432959. The next prime is 11378432983. The reversal of 11378432981 is 18923487311.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4726562500 + 6651870481 = 68750^2 + 81559^2 .

It is a cyclic number.

It is not a de Polignac number, because 11378432981 - 2¹⁰ = 11378431957 is a prime.

It is a super-2 number, since 2×11378432981² (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 (11378432983) 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, 572606 + ... + 592143.

It is an arithmetic number, because the mean of its divisors is an integer number (2844901875).

Almost surely, 2^11378432981 is an apocalyptic number.

It is an amenable number.

11378432981 is a deficient number, since it is larger than the sum of its proper divisors (1174519).

11378432981 is an equidigital number, since it uses as much as digits as its factorization.

11378432981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174518.

The product of its digits is 290304, while the sum is 47.

The spelling of 11378432981 in words is "eleven billion, three hundred seventy-eight million, four hundred thirty-two thousand, nine hundred eighty-one".