1961986145 has 16 divisors (see below), whose sum is σ = 2691615360. Its totient is φ = 1344916224.

The previous prime is 1961986129. The next prime is 1961986163. The reversal of 1961986145 is 5416891691.

It is a cyclic number.

It is not a de Polignac number, because 1961986145 - 2⁴ = 1961986129 is a prime.

It is a super-2 number, since 2×1961986145² = 7698779266343922050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1961986093 and 1961986102.

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, 125366 + ... + 140144.

It is an arithmetic number, because the mean of its divisors is an integer number (168225960).

Almost surely, 2^1961986145 is an apocalyptic number.

It is an amenable number.

1961986145 is a deficient number, since it is larger than the sum of its proper divisors (729629215).

1961986145 is a wasteful number, since it uses less digits than its factorization.

1961986145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18584.

The product of its digits is 466560, while the sum is 50.

The square root of 1961986145 is about 44294.3127839229. The cubic root of 1961986145 is about 1251.8875259620.

The spelling of 1961986145 in words is "one billion, nine hundred sixty-one million, nine hundred eighty-six thousand, one hundred forty-five".