1621351345 has 8 divisors (see below), whose sum is σ = 1948708800. Its totient is φ = 1295022960.

The previous prime is 1621351327. The next prime is 1621351349. The reversal of 1621351345 is 5431531261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1621351345 - 2⁵ = 1621351313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1621351349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253795 + ... + 260104.

It is an arithmetic number, because the mean of its divisors is an integer number (243588600).

Almost surely, 2^1621351345 is an apocalyptic number.

It is an amenable number.

1621351345 is a deficient number, since it is larger than the sum of its proper divisors (327357455).

1621351345 is an equidigital number, since it uses as much as digits as its factorization.

1621351345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514535.

The product of its digits is 10800, while the sum is 31.

The square root of 1621351345 is about 40266.0073138621. The cubic root of 1621351345 is about 1174.7867655909.

The spelling of 1621351345 in words is "one billion, six hundred twenty-one million, three hundred fifty-one thousand, three hundred forty-five".