1620361451 has 4 divisors (see below), whose sum is σ = 1659882504. Its totient is φ = 1580840400.

The previous prime is 1620361417. The next prime is 1620361469. The reversal of 1620361451 is 1541630261.

It is a happy number.

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 1620361451 - 2³⁰ = 546619627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620361411) 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 3 ways as a sum of consecutive naturals, for example, 19760465 + ... + 19760546.

It is an arithmetic number, because the mean of its divisors is an integer number (414970626).

Almost surely, 2^1620361451 is an apocalyptic number.

1620361451 is a deficient number, since it is larger than the sum of its proper divisors (39521053).

1620361451 is an equidigital number, since it uses as much as digits as its factorization.

1620361451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39521052.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1620361451 is about 40253.7135057127. The cubic root of 1620361451 is about 1174.5476335604.

The spelling of 1620361451 in words is "one billion, six hundred twenty million, three hundred sixty-one thousand, four hundred fifty-one".