121540807 has 2 divisors, whose sum is σ = 121540808. Its totient is φ = 121540806.

The previous prime is 121540759. The next prime is 121540817. The reversal of 121540807 is 708045121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121540807 is a prime.

It is a super-2 number, since 2×121540807² = 29544335532422498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121540817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60770403 + 60770404.

It is an arithmetic number, because the mean of its divisors is an integer number (60770404).

Almost surely, 2^121540807 is an apocalyptic number.

121540807 is a deficient number, since it is larger than the sum of its proper divisors (1).

121540807 is an equidigital number, since it uses as much as digits as its factorization.

121540807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 121540807 is about 11024.5547302374. The cubic root of 121540807 is about 495.3445304055.

Adding to 121540807 its reverse (708045121), we get a palindrome (829585928).

The spelling of 121540807 in words is "one hundred twenty-one million, five hundred forty thousand, eight hundred seven".