981869991461 has 4 divisors (see below), whose sum is σ = 1013543217024. Its totient is φ = 950196765900.

The previous prime is 981869991317. The next prime is 981869991463. The reversal of 981869991461 is 164199968189.

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, and also an emirpimes, since its reverse is a distinct semiprime: 164199968189 = 1879 ⋅87386891.

It is a cyclic number.

It is not a de Polignac number, because 981869991461 - 2¹⁴ = 981869975077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981869991463) 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, 15836612735 + ... + 15836612796.

It is an arithmetic number, because the mean of its divisors is an integer number (253385804256).

Almost surely, 2^981869991461 is an apocalyptic number.

It is an amenable number.

981869991461 is a deficient number, since it is larger than the sum of its proper divisors (31673225563).

981869991461 is a wasteful number, since it uses less digits than its factorization.

981869991461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31673225562.

The product of its digits is 60466176, while the sum is 71.

The spelling of 981869991461 in words is "nine hundred eighty-one billion, eight hundred sixty-nine million, nine hundred ninety-one thousand, four hundred sixty-one".