121517961 has 16 divisors (see below), whose sum is σ = 163464000. Its totient is φ = 80296128.

The previous prime is 121517951. The next prime is 121517971. The reversal of 121517961 is 169715121.

It is an interprime number because it is at equal distance from previous prime (121517951) and next prime (121517971).

It is not a de Polignac number, because 121517961 - 2¹¹ = 121515913 is a prime.

It is a super-2 number, since 2×121517961² = 29533229691195042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121517951) 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, 289810 + ... + 290228.

It is an arithmetic number, because the mean of its divisors is an integer number (10216500).

Almost surely, 2^121517961 is an apocalyptic number.

It is an amenable number.

121517961 is a deficient number, since it is larger than the sum of its proper divisors (41946039).

121517961 is a wasteful number, since it uses less digits than its factorization.

121517961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048.

The product of its digits is 3780, while the sum is 33.

The square root of 121517961 is about 11023.5185399218. The cubic root of 121517961 is about 495.3134918582.

The spelling of 121517961 in words is "one hundred twenty-one million, five hundred seventeen thousand, nine hundred sixty-one".