121612751 has 4 divisors (see below), whose sum is σ = 130967592. Its totient is φ = 112257912.

The previous prime is 121612739. The next prime is 121612759. The reversal of 121612751 is 157216121.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-121612751 is a prime.

It is a super-2 number, since 2×121612751² = 29579322411576002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121612751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121612759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4677401 + ... + 4677426.

It is an arithmetic number, because the mean of its divisors is an integer number (32741898).

Almost surely, 2^121612751 is an apocalyptic number.

121612751 is a deficient number, since it is larger than the sum of its proper divisors (9354841).

121612751 is an equidigital number, since it uses as much as digits as its factorization.

121612751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9354840.

The product of its digits is 840, while the sum is 26.

The square root of 121612751 is about 11027.8171457456. The cubic root of 121612751 is about 495.4422480322.

Adding to 121612751 its reverse (157216121), we get a palindrome (278828872).

The spelling of 121612751 in words is "one hundred twenty-one million, six hundred twelve thousand, seven hundred fifty-one".