133121615 has 16 divisors (see below), whose sum is σ = 174980736. Its totient is φ = 96420000.

The previous prime is 133121579. The next prime is 133121617. The reversal of 133121615 is 516121331.

It is not a de Polignac number, because 133121615 - 2²⁴ = 116344399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133121617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8984 + ... + 18626.

It is an arithmetic number, because the mean of its divisors is an integer number (10936296).

Almost surely, 2^133121615 is an apocalyptic number.

133121615 is a deficient number, since it is larger than the sum of its proper divisors (41859121).

133121615 is a wasteful number, since it uses less digits than its factorization.

133121615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9910.

The product of its digits is 540, while the sum is 23.

The square root of 133121615 is about 11537.8340688363. The cubic root of 133121615 is about 510.6024087531.

Adding to 133121615 its reverse (516121331), we get a palindrome (649242946).

The spelling of 133121615 in words is "one hundred thirty-three million, one hundred twenty-one thousand, six hundred fifteen".