1961869309154 has 16 divisors (see below), whose sum is σ = 3022882159608. Its totient is φ = 954251448192.

The previous prime is 1961869309129. The next prime is 1961869309163. The reversal of 1961869309154 is 4519039681691.

It can be written as a sum of positive squares in 4 ways, for example, as 1929334890025 + 32534419129 = 1389005^2 + 180373^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1966187 + ... + 2790990.

Almost surely, 2^{1961869309154} is an apocalyptic number.

1961869309154 is a deficient number, since it is larger than the sum of its proper divisors (1061012850454).

1961869309154 is a wasteful number, since it uses less digits than its factorization.

1961869309154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4762789.

The product of its (nonzero) digits is 12597120, while the sum is 62.

The spelling of 1961869309154 in words is "one trillion, nine hundred sixty-one billion, eight hundred sixty-nine million, three hundred nine thousand, one hundred fifty-four".