139309375781 has 8 divisors (see below), whose sum is σ = 140668596000. Its totient is φ = 137951216208.

The previous prime is 139309375633. The next prime is 139309375819. The reversal of 139309375781 is 187573903931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139309375781 - 2¹⁸ = 139309113637 is a prime.

It is a super-2 number, since 2×139309375781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139309375081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95 + ... + 527843.

It is an arithmetic number, because the mean of its divisors is an integer number (17583574500).

Almost surely, 2^139309375781 is an apocalyptic number.

It is an amenable number.

139309375781 is a deficient number, since it is larger than the sum of its proper divisors (1359220219).

139309375781 is a wasteful number, since it uses less digits than its factorization.

139309375781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530323.

The product of its (nonzero) digits is 4286520, while the sum is 56.

The spelling of 139309375781 in words is "one hundred thirty-nine billion, three hundred nine million, three hundred seventy-five thousand, seven hundred eighty-one".