340131534521 has 4 divisors (see below), whose sum is σ = 340325564532. Its totient is φ = 339937504512.

The previous prime is 340131534499. The next prime is 340131534527. The reversal of 340131534521 is 125435131043.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6782346025 + 333349188496 = 82355^2 + 577364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340131534521 is a prime.

It is a super-2 number, since 2×340131534521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340131534527) 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, 97012376 + ... + 97015881.

It is an arithmetic number, because the mean of its divisors is an integer number (85081391133).

Almost surely, 2^340131534521 is an apocalyptic number.

It is an amenable number.

340131534521 is a deficient number, since it is larger than the sum of its proper divisors (194030011).

340131534521 is a wasteful number, since it uses less digits than its factorization.

340131534521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194030010.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 340131534521 its reverse (125435131043), we get a palindrome (465566665564).

The spelling of 340131534521 in words is "three hundred forty billion, one hundred thirty-one million, five hundred thirty-four thousand, five hundred twenty-one".