621553052 has 6 divisors (see below), whose sum is σ = 1087717848. Its totient is φ = 310776524.

The previous prime is 621553021. The next prime is 621553087. The reversal of 621553052 is 250355126.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77694128 + ... + 77694135.

It is an arithmetic number, because the mean of its divisors is an integer number (181286308).

Almost surely, 2^621553052 is an apocalyptic number.

It is an amenable number.

621553052 is a deficient number, since it is larger than the sum of its proper divisors (466164796).

621553052 is a wasteful number, since it uses less digits than its factorization.

621553052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155388267 (or 155388265 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 621553052 is about 24930.9657253785. The cubic root of 621553052 is about 853.4132887456.

The spelling of 621553052 in words is "six hundred twenty-one million, five hundred fifty-three thousand, fifty-two".