1292840661 has 32 divisors (see below), whose sum is σ = 1994388480. Its totient is φ = 729680256.

The previous prime is 1292840651. The next prime is 1292840663. The reversal of 1292840661 is 1660482921.

It is not a de Polignac number, because 1292840661 - 2⁶ = 1292840597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1292840663) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1026250 + ... + 1027508.

It is an arithmetic number, because the mean of its divisors is an integer number (62324640).

Almost surely, 2^1292840661 is an apocalyptic number.

It is an amenable number.

1292840661 is a deficient number, since it is larger than the sum of its proper divisors (701547819).

1292840661 is a wasteful number, since it uses less digits than its factorization.

1292840661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1292840661 is about 35956.0935169548. The cubic root of 1292840661 is about 1089.3856934668.

The spelling of 1292840661 in words is "one billion, two hundred ninety-two million, eight hundred forty thousand, six hundred sixty-one".