121647431749 has 4 divisors (see below), whose sum is σ = 121936380940. Its totient is φ = 121358482560.

The previous prime is 121647431729. The next prime is 121647431753. The reversal of 121647431749 is 947134746121.

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 51180012900 + 70467418849 = 226230^2 + 265457^2 .

It is a cyclic number.

It is not a de Polignac number, because 121647431749 - 2⁷ = 121647431621 is a prime.

It is a super-2 number, since 2×121647431749² (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 (121647431729) 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, 144473964 + ... + 144474805.

It is an arithmetic number, because the mean of its divisors is an integer number (30484095235).

Almost surely, 2^121647431749 is an apocalyptic number.

It is an amenable number.

121647431749 is a deficient number, since it is larger than the sum of its proper divisors (288949191).

121647431749 is an equidigital number, since it uses as much as digits as its factorization.

121647431749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288949190.

The product of its digits is 1016064, while the sum is 49.

The spelling of 121647431749 in words is "one hundred twenty-one billion, six hundred forty-seven million, four hundred thirty-one thousand, seven hundred forty-nine".