121615541437 has 16 divisors (see below), whose sum is σ = 131162622192. Its totient is φ = 112096051200.

The previous prime is 121615541429. The next prime is 121615541441. The reversal of 121615541437 is 734145516121.

It can be written as a sum of positive squares in 8 ways, for example, as 2444906916 + 119170634521 = 49446^2 + 345211^2 .

It is a cyclic number.

It is not a de Polignac number, because 121615541437 - 2³ = 121615541429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121615541437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121615541737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41978373 + ... + 41981269.

It is an arithmetic number, because the mean of its divisors is an integer number (8197663887).

Almost surely, 2^121615541437 is an apocalyptic number.

It is an amenable number.

121615541437 is a deficient number, since it is larger than the sum of its proper divisors (9547080755).

121615541437 is a wasteful number, since it uses less digits than its factorization.

121615541437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6528.

The product of its digits is 100800, while the sum is 40.

The spelling of 121615541437 in words is "one hundred twenty-one billion, six hundred fifteen million, five hundred forty-one thousand, four hundred thirty-seven".