1961331790 has 16 divisors (see below), whose sum is σ = 3851342640. Its totient is φ = 713211520.

The previous prime is 1961331787. The next prime is 1961331797. The reversal of 1961331790 is 971331691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961331797) 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 7 ways as a sum of consecutive naturals, for example, 8915035 + ... + 8915254.

It is an arithmetic number, because the mean of its divisors is an integer number (240708915).

Almost surely, 2^1961331790 is an apocalyptic number.

1961331790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1961331790 is a deficient number, since it is larger than the sum of its proper divisors (1890010850).

1961331790 is a wasteful number, since it uses less digits than its factorization.

1961331790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17830307.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 1961331790 is about 44286.9257230619. The cubic root of 1961331790 is about 1251.7483353853.

Subtracting from 1961331790 its reverse (971331691), we obtain a palindrome (990000099).

The spelling of 1961331790 in words is "one billion, nine hundred sixty-one million, three hundred thirty-one thousand, seven hundred ninety".