1211055290 has 8 divisors (see below), whose sum is σ = 2179899540. Its totient is φ = 484422112.

The previous prime is 1211055289. The next prime is 1211055301. The reversal of 1211055290 is 925501121.

It can be written as a sum of positive squares in 2 ways, for example, as 1102040809 + 109014481 = 33197^2 + 10441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×1211055290³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60552755 + ... + 60552774.

Almost surely, 2^1211055290 is an apocalyptic number.

1211055290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211055290 is a deficient number, since it is larger than the sum of its proper divisors (968844250).

1211055290 is a wasteful number, since it uses less digits than its factorization.

1211055290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121105536.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 1211055290 is about 34800.2196832146. The cubic root of 1211055290 is about 1065.9119317059.

The spelling of 1211055290 in words is "one billion, two hundred eleven million, fifty-five thousand, two hundred ninety".