121631501257561 has 8 divisors (see below), whose sum is σ = 122167824448320. Its totient is φ = 121095182467248.

The previous prime is 121631501257507. The next prime is 121631501257649. The reversal of 121631501257561 is 165752105136121.

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 121631501257561 - 2²⁹ = 121630964386649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121631501257661) 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, 62353620 + ... + 64274698.

It is an arithmetic number, because the mean of its divisors is an integer number (15270978056040).

Almost surely, 2^{121631501257561} is an apocalyptic number.

It is an amenable number.

121631501257561 is a deficient number, since it is larger than the sum of its proper divisors (536323190759).

121631501257561 is a wasteful number, since it uses less digits than its factorization.

121631501257561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200223.

The product of its (nonzero) digits is 378000, while the sum is 46.

The spelling of 121631501257561 in words is "one hundred twenty-one trillion, six hundred thirty-one billion, five hundred one million, two hundred fifty-seven thousand, five hundred sixty-one".