101383390781 has 4 divisors (see below), whose sum is σ = 101385050364. Its totient is φ = 101381731200.

The previous prime is 101383390747. The next prime is 101383390873. The reversal of 101383390781 is 187093383101.

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 47945671225 + 53437719556 = 218965^2 + 231166^2 .

It is a cyclic number.

It is not a de Polignac number, because 101383390781 - 2¹⁴ = 101383374397 is a prime.

It is a super-2 number, since 2×101383390781² (a number of 23 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 (101383390741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734510 + ... + 861551.

It is an arithmetic number, because the mean of its divisors is an integer number (25346262591).

Almost surely, 2^101383390781 is an apocalyptic number.

It is an amenable number.

101383390781 is a deficient number, since it is larger than the sum of its proper divisors (1659583).

101383390781 is an equidigital number, since it uses as much as digits as its factorization.

101383390781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659582.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 101383390781 in words is "one hundred one billion, three hundred eighty-three million, three hundred ninety thousand, seven hundred eighty-one".