121540877 has 2 divisors, whose sum is σ = 121540878. Its totient is φ = 121540876.

The previous prime is 121540849. The next prime is 121540897. The reversal of 121540877 is 778045121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83521321 + 38019556 = 9139^2 + 6166^2 .

It is a cyclic number.

It is not a de Polignac number, because 121540877 - 2¹² = 121536781 is a prime.

It is equal to p_6924356 and since 121540877 and 6924356 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121540807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60770438 + 60770439.

It is an arithmetic number, because the mean of its divisors is an integer number (60770439).

Almost surely, 2^121540877 is an apocalyptic number.

It is an amenable number.

121540877 is a deficient number, since it is larger than the sum of its proper divisors (1).

121540877 is an equidigital number, since it uses as much as digits as its factorization.

121540877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 121540877 is about 11024.5579049683. The cubic root of 121540877 is about 495.3446255014.

Adding to 121540877 its reverse (778045121), we get a palindrome (899585998).

The spelling of 121540877 in words is "one hundred twenty-one million, five hundred forty thousand, eight hundred seventy-seven".