1961373349 has 4 divisors (see below), whose sum is σ = 2112248236. Its totient is φ = 1810498464.

The previous prime is 1961373331. The next prime is 1961373361. The reversal of 1961373349 is 9433731691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9433731691 = 157 ⋅60087463.

It can be written as a sum of positive squares in 2 ways, for example, as 386712225 + 1574661124 = 19665^2 + 39682^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961373349 - 2⁹ = 1961372837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1961373299 and 1961373308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961373329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75437424 + ... + 75437449.

It is an arithmetic number, because the mean of its divisors is an integer number (528062059).

Almost surely, 2^1961373349 is an apocalyptic number.

It is an amenable number.

1961373349 is a deficient number, since it is larger than the sum of its proper divisors (150874887).

1961373349 is a wasteful number, since it uses less digits than its factorization.

1961373349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150874886.

The product of its digits is 367416, while the sum is 46.

The square root of 1961373349 is about 44287.3949222575. The cubic root of 1961373349 is about 1251.7571764938.

The spelling of 1961373349 in words is "one billion, nine hundred sixty-one million, three hundred seventy-three thousand, three hundred forty-nine".