121561463 has 4 divisors (see below), whose sum is σ = 126846768. Its totient is φ = 116276160.

The previous prime is 121561457. The next prime is 121561469. The reversal of 121561463 is 364165121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 364165121 = 569 ⋅640009.

It is an interprime number because it is at equal distance from previous prime (121561457) and next prime (121561469).

It is a cyclic number.

It is not a de Polignac number, because 121561463 - 2¹² = 121557367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121561469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2642618 + ... + 2642663.

It is an arithmetic number, because the mean of its divisors is an integer number (31711692).

Almost surely, 2^121561463 is an apocalyptic number.

121561463 is a deficient number, since it is larger than the sum of its proper divisors (5285305).

121561463 is an equidigital number, since it uses as much as digits as its factorization.

121561463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5285304.

The product of its digits is 4320, while the sum is 29.

The square root of 121561463 is about 11025.4915083183. The cubic root of 121561463 is about 495.3725902736.

The spelling of 121561463 in words is "one hundred twenty-one million, five hundred sixty-one thousand, four hundred sixty-three".