1642763149 has 4 divisors (see below), whose sum is σ = 1643177536. Its totient is φ = 1642348764.

The previous prime is 1642763147. The next prime is 1642763153. The reversal of 1642763149 is 9413672461.

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: 9413672461 = 23 ⋅409290107.

It is a cyclic number.

It is not a de Polignac number, because 1642763149 - 2¹ = 1642763147 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 (1642763147) 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, 201189 + ... + 209194.

It is an arithmetic number, because the mean of its divisors is an integer number (410794384).

Almost surely, 2^1642763149 is an apocalyptic number.

It is an amenable number.

1642763149 is a deficient number, since it is larger than the sum of its proper divisors (414387).

1642763149 is an equidigital number, since it uses as much as digits as its factorization.

1642763149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414386.

The product of its digits is 217728, while the sum is 43.

The square root of 1642763149 is about 40531.0146554463. The cubic root of 1642763149 is about 1179.9356349551.

The spelling of 1642763149 in words is "one billion, six hundred forty-two million, seven hundred sixty-three thousand, one hundred forty-nine".