122356513 has 4 divisors (see below), whose sum is σ = 123439428. Its totient is φ = 121273600.

The previous prime is 122356511. The next prime is 122356517. The reversal of 122356513 is 315653221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315653221 = 13 ⋅24281017.

It can be written as a sum of positive squares in 2 ways, for example, as 47568609 + 74787904 = 6897^2 + 8648^2 .

It is a cyclic number.

It is not a de Polignac number, because 122356513 - 2¹ = 122356511 is a prime.

It is a super-2 number, since 2×122356513² = 29942232547038338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122356511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541288 + ... + 541513.

It is an arithmetic number, because the mean of its divisors is an integer number (30859857).

Almost surely, 2^122356513 is an apocalyptic number.

It is an amenable number.

122356513 is a deficient number, since it is larger than the sum of its proper divisors (1082915).

122356513 is a wasteful number, since it uses less digits than its factorization.

122356513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082914.

The product of its digits is 5400, while the sum is 28.

The square root of 122356513 is about 11061.4878294016. The cubic root of 122356513 is about 496.4502082653.

The spelling of 122356513 in words is "one hundred twenty-two million, three hundred fifty-six thousand, five hundred thirteen".