1621304263 has 4 divisors (see below), whose sum is σ = 1716675120. Its totient is φ = 1525933408.

The previous prime is 1621304249. The next prime is 1621304323. The reversal of 1621304263 is 3624031261.

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

It is a cyclic number.

It is not a de Polignac number, because 1621304263 - 2¹³ = 1621296071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621304203) 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, 47685403 + ... + 47685436.

It is an arithmetic number, because the mean of its divisors is an integer number (429168780).

Almost surely, 2^1621304263 is an apocalyptic number.

1621304263 is a deficient number, since it is larger than the sum of its proper divisors (95370857).

1621304263 is an equidigital number, since it uses as much as digits as its factorization.

1621304263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95370856.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1621304263 is about 40265.4226725611. The cubic root of 1621304263 is about 1174.7753940384.

The spelling of 1621304263 in words is "one billion, six hundred twenty-one million, three hundred four thousand, two hundred sixty-three".