1961135399 has 8 divisors (see below), whose sum is σ = 1968908448. Its totient is φ = 1953372960.

The previous prime is 1961135387. The next prime is 1961135461. The reversal of 1961135399 is 9935311691.

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

It is a cyclic number.

It is not a de Polignac number, because 1961135399 - 2¹⁶ = 1961069863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961135699) 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, 731249 + ... + 733925.

It is an arithmetic number, because the mean of its divisors is an integer number (246113556).

Almost surely, 2^1961135399 is an apocalyptic number.

1961135399 is a deficient number, since it is larger than the sum of its proper divisors (7773049).

1961135399 is a wasteful number, since it uses less digits than its factorization.

1961135399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5305.

The product of its digits is 196830, while the sum is 47.

The square root of 1961135399 is about 44284.7084104660. The cubic root of 1961135399 is about 1251.7065541979.

The spelling of 1961135399 in words is "one billion, nine hundred sixty-one million, one hundred thirty-five thousand, three hundred ninety-nine".