1291418990 has 16 divisors (see below), whose sum is σ = 2327041440. Its totient is φ = 516014880.

The previous prime is 1291418977. The next prime is 1291419007. The reversal of 1291418990 is 998141921.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59210 + ... + 78029.

It is an arithmetic number, because the mean of its divisors is an integer number (145440090).

Almost surely, 2^1291418990 is an apocalyptic number.

1291418990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291418990 is a deficient number, since it is larger than the sum of its proper divisors (1035622450).

1291418990 is a wasteful number, since it uses less digits than its factorization.

1291418990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138187.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 1291418990 is about 35936.3185371012. The cubic root of 1291418990 is about 1088.9862330292.

The spelling of 1291418990 in words is "one billion, two hundred ninety-one million, four hundred eighteen thousand, nine hundred ninety".