121399501 has 2 divisors, whose sum is σ = 121399502. Its totient is φ = 121399500.

The previous prime is 121399459. The next prime is 121399519. The reversal of 121399501 is 105993121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86471401 + 34928100 = 9299^2 + 5910^2 .

It is a cyclic number.

It is not a de Polignac number, because 121399501 - 2¹¹ = 121397453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121399561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60699750 + 60699751.

It is an arithmetic number, because the mean of its divisors is an integer number (60699751).

Almost surely, 2^121399501 is an apocalyptic number.

It is an amenable number.

121399501 is a deficient number, since it is larger than the sum of its proper divisors (1).

121399501 is an equidigital number, since it uses as much as digits as its factorization.

121399501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 121399501 is about 11018.1441722279. The cubic root of 121399501 is about 495.1524898351.

The spelling of 121399501 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, five hundred one".