1961402409 has 12 divisors (see below), whose sum is σ = 2839288452. Its totient is φ = 1304762400.

The previous prime is 1961402389. The next prime is 1961402411. The reversal of 1961402409 is 9042041691.

It is a happy number.

1961402409 is a `hidden beast` number, since 19 + 614 + 0 + 24 + 0 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1138860009 + 822542400 = 33747^2 + 28680^2 .

It is not a de Polignac number, because 1961402409 - 2¹⁹ = 1960878121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1961402459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232222 + ... + 240519.

It is an arithmetic number, because the mean of its divisors is an integer number (236607371).

Almost surely, 2^1961402409 is an apocalyptic number.

It is an amenable number.

1961402409 is a deficient number, since it is larger than the sum of its proper divisors (877886043).

1961402409 is a wasteful number, since it uses less digits than its factorization.

1961402409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473208 (or 473205 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1961402409 is about 44287.7230053657. The cubic root of 1961402409 is about 1251.7633585370.

The spelling of 1961402409 in words is "one billion, nine hundred sixty-one million, four hundred two thousand, four hundred nine".