342623521 has 4 divisors (see below), whose sum is σ = 345321472. Its totient is φ = 339925572.

The previous prime is 342623507. The next prime is 342623537. The reversal of 342623521 is 125326243.

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: 125326243 = 7 ⋅17903749.

It is a cyclic number.

It is not a de Polignac number, because 342623521 - 2⁹ = 342623009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 342623521.

It is not an unprimeable number, because it can be changed into a prime (342623551) 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, 1348785 + ... + 1349038.

It is an arithmetic number, because the mean of its divisors is an integer number (86330368).

Almost surely, 2^342623521 is an apocalyptic number.

It is an amenable number.

342623521 is a deficient number, since it is larger than the sum of its proper divisors (2697951).

342623521 is a wasteful number, since it uses less digits than its factorization.

342623521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697950.

The product of its digits is 8640, while the sum is 28.

The square root of 342623521 is about 18510.0924092777. The cubic root of 342623521 is about 699.7437980776.

Adding to 342623521 its reverse (125326243), we get a palindrome (467949764).

The spelling of 342623521 in words is "three hundred forty-two million, six hundred twenty-three thousand, five hundred twenty-one".