1642562461 has 4 divisors (see below), whose sum is σ = 1680761632. Its totient is φ = 1604363292.

The previous prime is 1642562399. The next prime is 1642562479. The reversal of 1642562461 is 1642652461.

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 1642562461 - 2⁷ = 1642562333 is a prime.

It is a super-2 number, since 2×1642562461² = 5396022876572753042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1642562461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642562261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19099521 + ... + 19099606.

It is an arithmetic number, because the mean of its divisors is an integer number (420190408).

Almost surely, 2^1642562461 is an apocalyptic number.

It is an amenable number.

1642562461 is a deficient number, since it is larger than the sum of its proper divisors (38199171).

1642562461 is an equidigital number, since it uses as much as digits as its factorization.

1642562461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38199170.

The product of its digits is 69120, while the sum is 37.

The square root of 1642562461 is about 40528.5388461020. The cubic root of 1642562461 is about 1179.8875840911.

Subtracting 1642562461 from its reverse (1642652461), we obtain a square (90000 = 300²).

The spelling of 1642562461 in words is "one billion, six hundred forty-two million, five hundred sixty-two thousand, four hundred sixty-one".