121616154 has 56 divisors (see below), whose sum is σ = 298415232. Its totient is φ = 36848520.

The previous prime is 121616141. The next prime is 121616167. The reversal of 121616154 is 451616121.

It is an interprime number because it is at equal distance from previous prime (121616141) and next prime (121616167).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 12247 + ... + 19829.

Almost surely, 2^121616154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121616154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149207616).

121616154 is an abundant number, since it is smaller than the sum of its proper divisors (176799078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121616154 is an equidigital number, since it uses as much as digits as its factorization.

121616154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7614 (or 7599 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 121616154 is about 11027.9714363069. The cubic root of 121616154 is about 495.4468691876.

The spelling of 121616154 in words is "one hundred twenty-one million, six hundred sixteen thousand, one hundred fifty-four".