1621342265 has 16 divisors (see below), whose sum is σ = 1956877056. Its totient is φ = 1289587200.

The previous prime is 1621342259. The next prime is 1621342271. The reversal of 1621342265 is 5622431261.

It is an interprime number because it is at equal distance from previous prime (1621342259) and next prime (1621342271).

It is not a de Polignac number, because 1621342265 - 2⁴ = 1621342249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 712169 + ... + 714441.

It is an arithmetic number, because the mean of its divisors is an integer number (122304816).

Almost surely, 2^1621342265 is an apocalyptic number.

It is an amenable number.

1621342265 is a deficient number, since it is larger than the sum of its proper divisors (335534791).

1621342265 is a wasteful number, since it uses less digits than its factorization.

1621342265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040.

The product of its digits is 17280, while the sum is 32.

The square root of 1621342265 is about 40265.8945635137. The cubic root of 1621342265 is about 1174.7845725471.

The spelling of 1621342265 in words is "one billion, six hundred twenty-one million, three hundred forty-two thousand, two hundred sixty-five".