1261331006 has 16 divisors (see below), whose sum is σ = 2041127088. Its totient is φ = 581126400.

The previous prime is 1261331003. The next prime is 1261331023. The reversal of 1261331006 is 6001331621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261331003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27635 + ... + 57326.

It is an arithmetic number, because the mean of its divisors is an integer number (127570443).

Almost surely, 2^1261331006 is an apocalyptic number.

1261331006 is a deficient number, since it is larger than the sum of its proper divisors (779796082).

1261331006 is a wasteful number, since it uses less digits than its factorization.

1261331006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85547.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1261331006 is about 35515.2221730345. Note that the first 3 decimals coincide. The cubic root of 1261331006 is about 1080.4624808248.

Adding to 1261331006 its reverse (6001331621), we get a palindrome (7262662627).

The spelling of 1261331006 in words is "one billion, two hundred sixty-one million, three hundred thirty-one thousand, six".