1261630090 has 32 divisors (see below), whose sum is σ = 2596913280. Its totient is φ = 432298944.

The previous prime is 1261630049. The next prime is 1261630103. The reversal of 1261630090 is 900361621.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139321 + ... + 148099.

It is an arithmetic number, because the mean of its divisors is an integer number (81153540).

Almost surely, 2^1261630090 is an apocalyptic number.

1261630090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261630090 is an abundant number, since it is smaller than the sum of its proper divisors (1335283190).

1261630090 is a wasteful number, since it uses less digits than its factorization.

1261630090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10846.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1261630090 is about 35519.4325686658. The cubic root of 1261630090 is about 1080.5478730285.

The spelling of 1261630090 in words is "one billion, two hundred sixty-one million, six hundred thirty thousand, ninety".