1642353261 has 4 divisors (see below), whose sum is σ = 2189804352. Its totient is φ = 1094902172.

The previous prime is 1642353253. The next prime is 1642353283. The reversal of 1642353261 is 1623532461.

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 1642353261 - 2³ = 1642353253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642353961) 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, 273725541 + ... + 273725546.

It is an arithmetic number, because the mean of its divisors is an integer number (547451088).

Almost surely, 2^1642353261 is an apocalyptic number.

It is an amenable number.

1642353261 is a deficient number, since it is larger than the sum of its proper divisors (547451091).

1642353261 is an equidigital number, since it uses as much as digits as its factorization.

1642353261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547451090.

The product of its digits is 25920, while the sum is 33.

The square root of 1642353261 is about 40525.9578665329. The cubic root of 1642353261 is about 1179.8374910265.

It can be divided in two parts, 1642 and 353261, that added together give a triangular number (354903 = T₈₄₂).

The spelling of 1642353261 in words is "one billion, six hundred forty-two million, three hundred fifty-three thousand, two hundred sixty-one".