1211552146 has 32 divisors (see below), whose sum is σ = 2123078400. Its totient is φ = 518319648.

The previous prime is 1211552131. The next prime is 1211552183. The reversal of 1211552146 is 6412551121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508510 + ... + 510886.

It is an arithmetic number, because the mean of its divisors is an integer number (66346200).

Almost surely, 2^1211552146 is an apocalyptic number.

1211552146 is a deficient number, since it is larger than the sum of its proper divisors (911526254).

1211552146 is an equidigital number, since it uses as much as digits as its factorization.

1211552146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143 (or 3129 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 1211552146 is about 34807.3576417401. The cubic root of 1211552146 is about 1066.0576812664.

It can be divided in two parts, 12115 and 52146, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 1211552146 in words is "one billion, two hundred eleven million, five hundred fifty-two thousand, one hundred forty-six".