1961558343 has 16 divisors (see below), whose sum is σ = 2908773600. Its totient is φ = 1306463040.

The previous prime is 1961558303. The next prime is 1961558407. The reversal of 1961558343 is 3438551691.

1961558343 is a `hidden beast` number, since 1 + 9 + 61 + 5 + 583 + 4 + 3 = 666.

It is not a de Polignac number, because 1961558343 - 2⁸ = 1961558087 is a prime.

It is a super-4 number, since 4×1961558343⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961558303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5118 + ... + 62843.

It is an arithmetic number, because the mean of its divisors is an integer number (181798350).

Almost surely, 2^1961558343 is an apocalyptic number.

1961558343 is a deficient number, since it is larger than the sum of its proper divisors (947215257).

1961558343 is a wasteful number, since it uses less digits than its factorization.

1961558343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69039 (or 69033 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 1961558343 is about 44289.4834356871. The cubic root of 1961558343 is about 1251.7965299206.

The spelling of 1961558343 in words is "one billion, nine hundred sixty-one million, five hundred fifty-eight thousand, three hundred forty-three".