1641330451 has 4 divisors (see below), whose sum is σ = 1642076352. Its totient is φ = 1640584552.

The previous prime is 1641330421. The next prime is 1641330463. The reversal of 1641330451 is 1540331461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1540331461 = 17 ⋅90607733.

It is a cyclic number.

It is not a de Polignac number, because 1641330451 - 2⁵ = 1641330419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641330401) 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, 369640 + ... + 374053.

It is an arithmetic number, because the mean of its divisors is an integer number (410519088).

Almost surely, 2^1641330451 is an apocalyptic number.

1641330451 is a deficient number, since it is larger than the sum of its proper divisors (745901).

1641330451 is an equidigital number, since it uses as much as digits as its factorization.

1641330451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745900.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1641330451 is about 40513.3367053369. The cubic root of 1641330451 is about 1179.5925173031.

It can be divided in two parts, 16413 and 30451, that added together give a palindrome (46864).

The spelling of 1641330451 in words is "one billion, six hundred forty-one million, three hundred thirty thousand, four hundred fifty-one".