621631542 has 24 divisors (see below), whose sum is σ = 1446245496. Its totient is φ = 177608928.

The previous prime is 621631529. The next prime is 621631547. The reversal of 621631542 is 245136126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621631547) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1056903 + ... + 1057490.

It is an arithmetic number, because the mean of its divisors is an integer number (60260229).

Almost surely, 2^621631542 is an apocalyptic number.

621631542 is an abundant number, since it is smaller than the sum of its proper divisors (824613954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621631542 is a wasteful number, since it uses less digits than its factorization.

621631542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114412 (or 2114405 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 621631542 is about 24932.5398224890. The cubic root of 621631542 is about 853.4492103721.

Adding to 621631542 its reverse (245136126), we get a palindrome (866767668).

The spelling of 621631542 in words is "six hundred twenty-one million, six hundred thirty-one thousand, five hundred forty-two".