1291347902 has 32 divisors (see below), whose sum is σ = 2161615680. Its totient is φ = 574479360.

The previous prime is 1291347877. The next prime is 1291347907. The reversal of 1291347902 is 2097431921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291347907) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 619502 + ... + 621582.

It is an arithmetic number, because the mean of its divisors is an integer number (67550490).

Almost surely, 2^1291347902 is an apocalyptic number.

1291347902 is a deficient number, since it is larger than the sum of its proper divisors (870267778).

1291347902 is a wasteful number, since it uses less digits than its factorization.

1291347902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2948.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 1291347902 is about 35935.3294405380. The cubic root of 1291347902 is about 1088.9662510625.

The spelling of 1291347902 in words is "one billion, two hundred ninety-one million, three hundred forty-seven thousand, nine hundred two".