121611566154131 has 4 divisors (see below), whose sum is σ = 122120401159200. Its totient is φ = 121102731149064.

The previous prime is 121611566154121. The next prime is 121611566154151. The reversal of 121611566154131 is 131451665116121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121611566154131 - 2⁴² = 117213519643027 is a prime.

It is a super-2 number, since 2×121611566154131² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121611566154101) 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, 254417502176 + ... + 254417502653.

It is an arithmetic number, because the mean of its divisors is an integer number (30530100289800).

Almost surely, 2^{121611566154131} is an apocalyptic number.

121611566154131 is a deficient number, since it is larger than the sum of its proper divisors (508835005069).

121611566154131 is an equidigital number, since it uses as much as digits as its factorization.

121611566154131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508835005068.

The product of its digits is 129600, while the sum is 44.

The spelling of 121611566154131 in words is "one hundred twenty-one trillion, six hundred eleven billion, five hundred sixty-six million, one hundred fifty-four thousand, one hundred thirty-one".