1295124521 has 4 divisors (see below), whose sum is σ = 1295299200. Its totient is φ = 1294949844.

The previous prime is 1295124497. The next prime is 1295124533. The reversal of 1295124521 is 1254215921.

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.

It is a cyclic number.

It is not a de Polignac number, because 1295124521 - 2²² = 1290930217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1295124221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75701 + ... + 91218.

It is an arithmetic number, because the mean of its divisors is an integer number (323824800).

Almost surely, 2^1295124521 is an apocalyptic number.

It is an amenable number.

1295124521 is a deficient number, since it is larger than the sum of its proper divisors (174679).

1295124521 is an equidigital number, since it uses as much as digits as its factorization.

1295124521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174678.

The product of its digits is 7200, while the sum is 32.

The square root of 1295124521 is about 35987.8385152540. The cubic root of 1295124521 is about 1090.0267987127.

The spelling of 1295124521 in words is "one billion, two hundred ninety-five million, one hundred twenty-four thousand, five hundred twenty-one".