621134542 has 16 divisors (see below), whose sum is σ = 1127437920. Its totient is φ = 250541568.

The previous prime is 621134533. The next prime is 621134561. The reversal of 621134542 is 245431126.

It is a self number, because there is not a number n which added to its sum of digits gives 621134542.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1304667 + ... + 1305142.

It is an arithmetic number, because the mean of its divisors is an integer number (70464870).

Almost surely, 2^621134542 is an apocalyptic number.

621134542 is a deficient number, since it is larger than the sum of its proper divisors (506303378).

621134542 is a wasteful number, since it uses less digits than its factorization.

621134542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609835.

The product of its digits is 5760, while the sum is 28.

The square root of 621134542 is about 24922.5709347972. The cubic root of 621134542 is about 853.2217029607.

Adding to 621134542 its reverse (245431126), we get a palindrome (866565668).

The spelling of 621134542 in words is "six hundred twenty-one million, one hundred thirty-four thousand, five hundred forty-two".