1641402541 has 4 divisors (see below), whose sum is σ = 1657338592. Its totient is φ = 1625466492.

The previous prime is 1641402517. The next prime is 1641402563. The reversal of 1641402541 is 1452041461.

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: 1452041461 = 13 ⋅111695497.

It is a cyclic number.

It is not a de Polignac number, because 1641402541 - 2¹⁷ = 1641271469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641402341) 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, 7967871 + ... + 7968076.

It is an arithmetic number, because the mean of its divisors is an integer number (414334648).

Almost surely, 2^1641402541 is an apocalyptic number.

It is an amenable number.

1641402541 is a deficient number, since it is larger than the sum of its proper divisors (15936051).

1641402541 is a wasteful number, since it uses less digits than its factorization.

1641402541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15936050.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1641402541 is about 40514.2264025860. The cubic root of 1641402541 is about 1179.6097869475.

The spelling of 1641402541 in words is "one billion, six hundred forty-one million, four hundred two thousand, five hundred forty-one".