1961411505 has 16 divisors (see below), whose sum is σ = 3214802304. Its totient is φ = 1020571520.

The previous prime is 1961411497. The next prime is 1961411531. The reversal of 1961411505 is 5051141691.

It is not a de Polignac number, because 1961411505 - 2³ = 1961411497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1594029 + ... + 1595258.

It is an arithmetic number, because the mean of its divisors is an integer number (200925144).

Almost surely, 2^1961411505 is an apocalyptic number.

1961411505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1961411505 is a deficient number, since it is larger than the sum of its proper divisors (1253390799).

1961411505 is a wasteful number, since it uses less digits than its factorization.

1961411505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189336.

The product of its (nonzero) digits is 5400, while the sum is 33.

The square root of 1961411505 is about 44287.8256973629. The cubic root of 1961411505 is about 1251.7652935507.

The spelling of 1961411505 in words is "one billion, nine hundred sixty-one million, four hundred eleven thousand, five hundred five".