151115521 has 8 divisors (see below), whose sum is σ = 152509320. Its totient is φ = 149726208.

The previous prime is 151115509. The next prime is 151115539. The reversal of 151115521 is 125511151.

It can be written as a sum of positive squares in 4 ways, for example, as 29322225 + 121793296 = 5415^2 + 11036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 151115521 - 2⁹ = 151115009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 151115492 and 151115501.

It is not an unprimeable number, because it can be changed into a prime (151115581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133285 + ... + 134413.

It is an arithmetic number, because the mean of its divisors is an integer number (19063665).

Almost surely, 2^151115521 is an apocalyptic number.

It is an amenable number.

151115521 is a deficient number, since it is larger than the sum of its proper divisors (1393799).

151115521 is a wasteful number, since it uses less digits than its factorization.

151115521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243.

The product of its digits is 250, while the sum is 22.

The square root of 151115521 is about 12292.9053116015. The cubic root of 151115521 is about 532.6431639869.

Adding to 151115521 its reverse (125511151), we get a palindrome (276626672).

The spelling of 151115521 in words is "one hundred fifty-one million, one hundred fifteen thousand, five hundred twenty-one".