121980986 has 16 divisors (see below), whose sum is σ = 187743528. Its totient is φ = 59404800.

The previous prime is 121980973. The next prime is 121981019. The reversal of 121980986 is 689089121.

It can be written as a sum of positive squares in 4 ways, for example, as 91565761 + 30415225 = 9569^2 + 5515^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88946 + ... + 90306.

Almost surely, 2^121980986 is an apocalyptic number.

121980986 is a deficient number, since it is larger than the sum of its proper divisors (65762542).

121980986 is a wasteful number, since it uses less digits than its factorization.

121980986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 121980986 is about 11044.5002603106. The cubic root of 121980986 is about 495.9417991239.

The spelling of 121980986 in words is "one hundred twenty-one million, nine hundred eighty thousand, nine hundred eighty-six".