1961981319 has 8 divisors (see below), whose sum is σ = 2616227200. Its totient is φ = 1307861496.

The previous prime is 1961981317. The next prime is 1961981321. The reversal of 1961981319 is 9131891691.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1961981317) and next prime (1961981321).

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

It is not a de Polignac number, because 1961981319 - 2¹ = 1961981317 is a prime.

It is a super-2 number, since 2×1961981319² = 7698741392209959522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961981317) 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, 14334 + ... + 64260.

It is an arithmetic number, because the mean of its divisors is an integer number (327028400).

Almost surely, 2^1961981319 is an apocalyptic number.

1961981319 is a deficient number, since it is larger than the sum of its proper divisors (654245881).

1961981319 is a wasteful number, since it uses less digits than its factorization.

1961981319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63029.

The product of its digits is 104976, while the sum is 48.

The square root of 1961981319 is about 44294.2583073698. The cubic root of 1961981319 is about 1251.8864995167.

The spelling of 1961981319 in words is "one billion, nine hundred sixty-one million, nine hundred eighty-one thousand, three hundred nineteen".