1961441691 has 32 divisors (see below), whose sum is σ = 3033676800. Its totient is φ = 1114068480.

The previous prime is 1961441659. The next prime is 1961441693.

1961441691 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1961441691 - 2⁵ = 1961441659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1961441693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126765 + ... + 141393.

It is an arithmetic number, because the mean of its divisors is an integer number (94802400).

Almost surely, 2^1961441691 is an apocalyptic number.

1961441691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1961441691 is a deficient number, since it is larger than the sum of its proper divisors (1072235109).

1961441691 is a wasteful number, since it uses less digits than its factorization.

1961441691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14899.

The product of its digits is 46656, while the sum is 42.

The square root of 1961441691 is about 44288.1664894811. The cubic root of 1961441691 is about 1251.7717150475.

The spelling of 1961441691 in words is "one billion, nine hundred sixty-one million, four hundred forty-one thousand, six hundred ninety-one".