121315445 has 4 divisors (see below), whose sum is σ = 145578540. Its totient is φ = 97052352.

The previous prime is 121315421. The next prime is 121315459. The reversal of 121315445 is 544513121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544513121 = 5449 ⋅99929.

It can be written as a sum of positive squares in 2 ways, for example, as 49252324 + 72063121 = 7018^2 + 8489^2 .

It is a cyclic number.

It is not a de Polignac number, because 121315445 - 2⁸ = 121315189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12131540 + ... + 12131549.

It is an arithmetic number, because the mean of its divisors is an integer number (36394635).

Almost surely, 2^121315445 is an apocalyptic number.

It is an amenable number.

121315445 is a deficient number, since it is larger than the sum of its proper divisors (24263095).

121315445 is an equidigital number, since it uses as much as digits as its factorization.

121315445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24263094.

The product of its digits is 2400, while the sum is 26.

The square root of 121315445 is about 11014.3290762534. The cubic root of 121315445 is about 495.0381836341.

Adding to 121315445 its reverse (544513121), we get a palindrome (665828566).

It can be divided in two parts, 12131 and 5445, that added together give a cube (17576 = 26³).

The spelling of 121315445 in words is "one hundred twenty-one million, three hundred fifteen thousand, four hundred forty-five".