1642145149 has 4 divisors (see below), whose sum is σ = 1647494464. Its totient is φ = 1636795836.

The previous prime is 1642145119. The next prime is 1642145207. The reversal of 1642145149 is 9415412461.

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.

It is a cyclic number.

It is not a de Polignac number, because 1642145149 - 2²⁹ = 1105274237 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 (1642145119) 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, 2674197 + ... + 2674810.

It is an arithmetic number, because the mean of its divisors is an integer number (411873616).

Almost surely, 2^1642145149 is an apocalyptic number.

It is an amenable number.

1642145149 is a deficient number, since it is larger than the sum of its proper divisors (5349315).

1642145149 is an equidigital number, since it uses as much as digits as its factorization.

1642145149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5349314.

The product of its digits is 34560, while the sum is 37.

The square root of 1642145149 is about 40523.3901469263. The cubic root of 1642145149 is about 1179.7876542633.

The spelling of 1642145149 in words is "one billion, six hundred forty-two million, one hundred forty-five thousand, one hundred forty-nine".