1961220543 has 8 divisors (see below), whose sum is σ = 2617556400. Its totient is φ = 1306182528.

The previous prime is 1961220523. The next prime is 1961220551. The reversal of 1961220543 is 3450221691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1961220543 - 2²⁹ = 1424349631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961220523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320928 + ... + 326981.

It is an arithmetic number, because the mean of its divisors is an integer number (327194550).

Almost surely, 2^1961220543 is an apocalyptic number.

1961220543 is a deficient number, since it is larger than the sum of its proper divisors (656335857).

1961220543 is a wasteful number, since it uses less digits than its factorization.

1961220543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648921.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 1961220543 is about 44285.6697250928. The cubic root of 1961220543 is about 1251.7246684938.

The spelling of 1961220543 in words is "one billion, nine hundred sixty-one million, two hundred twenty thousand, five hundred forty-three".