121378877 has 2 divisors, whose sum is σ = 121378878. Its totient is φ = 121378876.

The previous prime is 121378847. The next prime is 121378903. The reversal of 121378877 is 778873121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120253156 + 1125721 = 10966^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 121378877 - 2¹⁸ = 121116733 is a prime.

It is a super-2 number, since 2×121378877² = 29465663563562258, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121378847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60689438 + 60689439.

It is an arithmetic number, because the mean of its divisors is an integer number (60689439).

Almost surely, 2^121378877 is an apocalyptic number.

It is an amenable number.

121378877 is a deficient number, since it is larger than the sum of its proper divisors (1).

121378877 is an equidigital number, since it uses as much as digits as its factorization.

121378877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131712, while the sum is 44.

The square root of 121378877 is about 11017.2082216867. The cubic root of 121378877 is about 495.1244485246.

The spelling of 121378877 in words is "one hundred twenty-one million, three hundred seventy-eight thousand, eight hundred seventy-seven".