121513751 has 2 divisors, whose sum is σ = 121513752. Its totient is φ = 121513750.

The previous prime is 121513723. The next prime is 121513783. The reversal of 121513751 is 157315121.

It is a weak prime.

It is an emirp because it is prime and its reverse (157315121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121513751 - 2¹⁴ = 121497367 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121513751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121518751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60756875 + 60756876.

It is an arithmetic number, because the mean of its divisors is an integer number (60756876).

Almost surely, 2^121513751 is an apocalyptic number.

121513751 is a deficient number, since it is larger than the sum of its proper divisors (1).

121513751 is an equidigital number, since it uses as much as digits as its factorization.

121513751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1050, while the sum is 26.

The square root of 121513751 is about 11023.3275829034. The cubic root of 121513751 is about 495.3077717329.

Adding to 121513751 its reverse (157315121), we get a palindrome (278828872).

The spelling of 121513751 in words is "one hundred twenty-one million, five hundred thirteen thousand, seven hundred fifty-one".