121697520 has 160 divisors (see below), whose sum is σ = 435829248. Its totient is φ = 27515904.

The previous prime is 121697507. The next prime is 121697533. The reversal of 121697520 is 25796121.

121697520 = T₁₈₃ + T₁₈₄ + ... + T₉₀₂.

It is an interprime number because it is at equal distance from previous prime (121697507) and next prime (121697533).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179422 + ... + 180098.

Almost surely, 2^121697520 is an apocalyptic number.

121697520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121697520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217914624).

121697520 is an abundant number, since it is smaller than the sum of its proper divisors (314131728).

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

121697520 is a wasteful number, since it uses less digits than its factorization.

121697520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 121697520 is about 11031.6598932346. The cubic root of 121697520 is about 495.5573357162.

The spelling of 121697520 in words is "one hundred twenty-one million, six hundred ninety-seven thousand, five hundred twenty".