1641081629 has 4 divisors (see below), whose sum is σ = 1790270880. Its totient is φ = 1491892380.

The previous prime is 1641081619. The next prime is 1641081643. The reversal of 1641081629 is 9261801461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9261801461 = 11 ⋅841981951.

It is not a de Polignac number, because 1641081629 - 2⁴ = 1641081613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1641081592 and 1641081601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641081619) 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, 74594609 + ... + 74594630.

It is an arithmetic number, because the mean of its divisors is an integer number (447567720).

Almost surely, 2^1641081629 is an apocalyptic number.

It is an amenable number.

1641081629 is a deficient number, since it is larger than the sum of its proper divisors (149189251).

1641081629 is a wasteful number, since it uses less digits than its factorization.

1641081629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149189250.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1641081629 is about 40510.2657236410. The cubic root of 1641081629 is about 1179.5329064343.

The spelling of 1641081629 in words is "one billion, six hundred forty-one million, eighty-one thousand, six hundred twenty-nine".