1521521151 has 4 divisors (see below), whose sum is σ = 2028694872. Its totient is φ = 1014347432.

The previous prime is 1521521147. The next prime is 1521521153. The reversal of 1521521151 is 1511251251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1511251251 = 3 ⋅503750417.

It is a cyclic number.

It is not a de Polignac number, because 1521521151 - 2² = 1521521147 is a prime.

It is a super-2 number, since 2×1521521151² = 4630053225880729602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521521153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253586856 + ... + 253586861.

It is an arithmetic number, because the mean of its divisors is an integer number (507173718).

Almost surely, 2^1521521151 is an apocalyptic number.

1521521151 is a deficient number, since it is larger than the sum of its proper divisors (507173721).

1521521151 is an equidigital number, since it uses as much as digits as its factorization.

1521521151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507173720.

The product of its digits is 500, while the sum is 24.

The square root of 1521521151 is about 39006.6808508491. The cubic root of 1521521151 is about 1150.1628379369.

The spelling of 1521521151 in words is "one billion, five hundred twenty-one million, five hundred twenty-one thousand, one hundred fifty-one".