121977015 has 16 divisors (see below), whose sum is σ = 197177568. Its totient is φ = 64382976.

The previous prime is 121977007. The next prime is 121977019. The reversal of 121977015 is 510779121.

It is not a de Polignac number, because 121977015 - 2³ = 121977007 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121977019) 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, 40462 + ... + 43371.

It is an arithmetic number, because the mean of its divisors is an integer number (12323598).

Almost surely, 2^121977015 is an apocalyptic number.

121977015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121977015 is a deficient number, since it is larger than the sum of its proper divisors (75200553).

121977015 is an equidigital number, since it uses as much as digits as its factorization.

121977015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83938.

The product of its (nonzero) digits is 4410, while the sum is 33.

The square root of 121977015 is about 11044.3204861141. The cubic root of 121977015 is about 495.9364173938.

The spelling of 121977015 in words is "one hundred twenty-one million, nine hundred seventy-seven thousand, fifteen".