1961393505 has 16 divisors (see below), whose sum is σ = 3138791040. Its totient is φ = 1045889408.

The previous prime is 1961393491. The next prime is 1961393521. The reversal of 1961393505 is 5053931691.

It is a cyclic number.

It is not a de Polignac number, because 1961393505 - 2¹³ = 1961385313 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 131509 + ... + 145661.

It is an arithmetic number, because the mean of its divisors is an integer number (196174440).

Almost surely, 2^1961393505 is an apocalyptic number.

1961393505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1961393505 is a deficient number, since it is larger than the sum of its proper divisors (1177397535).

1961393505 is a wasteful number, since it uses less digits than its factorization.

1961393505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23400.

The product of its (nonzero) digits is 109350, while the sum is 42.

The square root of 1961393505 is about 44287.6224807790. The cubic root of 1961393505 is about 1251.7614643620.

The spelling of 1961393505 in words is "one billion, nine hundred sixty-one million, three hundred ninety-three thousand, five hundred five".