1961159061 has 4 divisors (see below), whose sum is σ = 2614878752. Its totient is φ = 1307439372.

The previous prime is 1961159059. The next prime is 1961159087. The reversal of 1961159061 is 1609511691.

It is a happy number.

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 not a de Polignac number, because 1961159061 - 2¹ = 1961159059 is a prime.

It is a super-2 number, since 2×1961159061² = 7692289725084803442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961159021) 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, 326859841 + ... + 326859846.

It is an arithmetic number, because the mean of its divisors is an integer number (653719688).

Almost surely, 2^1961159061 is an apocalyptic number.

It is an amenable number.

1961159061 is a deficient number, since it is larger than the sum of its proper divisors (653719691).

1961159061 is an equidigital number, since it uses as much as digits as its factorization.

1961159061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653719690.

The product of its (nonzero) digits is 14580, while the sum is 39.

The square root of 1961159061 is about 44284.9755673411. The cubic root of 1961159061 is about 1251.7115883160.

The spelling of 1961159061 in words is "one billion, nine hundred sixty-one million, one hundred fifty-nine thousand, sixty-one".