121399519 has 2 divisors, whose sum is σ = 121399520. Its totient is φ = 121399518.

The previous prime is 121399501. The next prime is 121399547. The reversal of 121399519 is 915993121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121399519 is a prime.

It is a super-2 number, since 2×121399519² = 29475686426862722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121399559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60699759 + 60699760.

It is an arithmetic number, because the mean of its divisors is an integer number (60699760).

Almost surely, 2^121399519 is an apocalyptic number.

121399519 is a deficient number, since it is larger than the sum of its proper divisors (1).

121399519 is an equidigital number, since it uses as much as digits as its factorization.

121399519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21870, while the sum is 40.

The square root of 121399519 is about 11018.1449890624. The cubic root of 121399519 is about 495.1525143073.

The spelling of 121399519 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, five hundred nineteen".