121977937 has 4 divisors (see below), whose sum is σ = 125274676. Its totient is φ = 118681200.

The previous prime is 121977931. The next prime is 121977959. The reversal of 121977937 is 739779121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 739779121 = 311 ⋅2378711.

It can be written as a sum of positive squares in 2 ways, for example, as 103306896 + 18671041 = 10164^2 + 4321^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121977937 is a prime.

It is a super-2 number, since 2×121977937² = 29757234229551938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121977931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1648314 + ... + 1648387.

It is an arithmetic number, because the mean of its divisors is an integer number (31318669).

Almost surely, 2^121977937 is an apocalyptic number.

It is an amenable number.

121977937 is a deficient number, since it is larger than the sum of its proper divisors (3296739).

121977937 is an equidigital number, since it uses as much as digits as its factorization.

121977937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3296738.

The product of its digits is 166698, while the sum is 46.

The square root of 121977937 is about 11044.3622269464. The cubic root of 121977937 is about 495.9376669522.

The spelling of 121977937 in words is "one hundred twenty-one million, nine hundred seventy-seven thousand, nine hundred thirty-seven".