1261945004 has 6 divisors (see below), whose sum is σ = 2208403764. Its totient is φ = 630972500.

The previous prime is 1261945001. The next prime is 1261945007. The reversal of 1261945004 is 4005491621.

It is an interprime number because it is at equal distance from previous prime (1261945001) and next prime (1261945007).

It is not an unprimeable number, because it can be changed into a prime (1261945001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157743122 + ... + 157743129.

It is an arithmetic number, because the mean of its divisors is an integer number (368067294).

Almost surely, 2^1261945004 is an apocalyptic number.

It is an amenable number.

1261945004 is a deficient number, since it is larger than the sum of its proper divisors (946458760).

1261945004 is a wasteful number, since it uses less digits than its factorization.

1261945004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315486255 (or 315486253 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1261945004 is about 35523.8652739254. The cubic root of 1261945004 is about 1080.6377703096.

The spelling of 1261945004 in words is "one billion, two hundred sixty-one million, nine hundred forty-five thousand, four".