1261422290 has 16 divisors (see below), whose sum is σ = 2285599680. Its totient is φ = 501226800.

The previous prime is 1261422269. The next prime is 1261422307. The reversal of 1261422290 is 922241621.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416180 + ... + 419199.

It is an arithmetic number, because the mean of its divisors is an integer number (142849980).

Almost surely, 2^1261422290 is an apocalyptic number.

1261422290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261422290 is a deficient number, since it is larger than the sum of its proper divisors (1024177390).

1261422290 is a wasteful number, since it uses less digits than its factorization.

1261422290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835537.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1261422290 is about 35516.5072888650. The cubic root of 1261422290 is about 1080.4885449739.

The spelling of 1261422290 in words is "one billion, two hundred sixty-one million, four hundred twenty-two thousand, two hundred ninety".