1351275521 has 4 divisors (see below), whose sum is σ = 1380026112. Its totient is φ = 1322524932.

The previous prime is 1351275517. The next prime is 1351275529. The reversal of 1351275521 is 1255721531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1255721531 = 3637 ⋅345263.

It is a cyclic number.

It is not a de Polignac number, because 1351275521 - 2² = 1351275517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1351275529) 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, 14375225 + ... + 14375318.

It is an arithmetic number, because the mean of its divisors is an integer number (345006528).

Almost surely, 2^1351275521 is an apocalyptic number.

It is an amenable number.

1351275521 is a deficient number, since it is larger than the sum of its proper divisors (28750591).

1351275521 is an equidigital number, since it uses as much as digits as its factorization.

1351275521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28750590.

The product of its digits is 10500, while the sum is 32.

The square root of 1351275521 is about 36759.6996859332. The cubic root of 1351275521 is about 1105.5574185091.

The spelling of 1351275521 in words is "one billion, three hundred fifty-one million, two hundred seventy-five thousand, five hundred twenty-one".