137868921291 has 8 divisors (see below), whose sum is σ = 184025259520. Its totient is φ = 91812598632.

The previous prime is 137868921263. The next prime is 137868921343. The reversal of 137868921291 is 192129868731.

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

It is not a de Polignac number, because 137868921291 - 2¹⁸ = 137868659147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137868921221) 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, 25000675 + ... + 25006188.

It is an arithmetic number, because the mean of its divisors is an integer number (23003157440).

Almost surely, 2^137868921291 is an apocalyptic number.

137868921291 is a deficient number, since it is larger than the sum of its proper divisors (46156338229).

137868921291 is an equidigital number, since it uses as much as digits as its factorization.

137868921291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50007785.

The product of its digits is 2612736, while the sum is 57.

The spelling of 137868921291 in words is "one hundred thirty-seven billion, eight hundred sixty-eight million, nine hundred twenty-one thousand, two hundred ninety-one".