121970887 has 4 divisors (see below), whose sum is σ = 123791416. Its totient is φ = 120150360.

The previous prime is 121970873. The next prime is 121970911. The reversal of 121970887 is 788079121.

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: 788079121 = 4967 ⋅158663.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121970887 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 (121970837) 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, 910164 + ... + 910297.

It is an arithmetic number, because the mean of its divisors is an integer number (30947854).

Almost surely, 2^121970887 is an apocalyptic number.

121970887 is a deficient number, since it is larger than the sum of its proper divisors (1820529).

121970887 is an equidigital number, since it uses as much as digits as its factorization.

121970887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820528.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 121970887 is about 11044.0430549686. The cubic root of 121970887 is about 495.9281121426.

The spelling of 121970887 in words is "one hundred twenty-one million, nine hundred seventy thousand, eight hundred eighty-seven".