1141221987 has 16 divisors (see below), whose sum is σ = 1691224480. Its totient is φ = 760578336.

The previous prime is 1141221943. The next prime is 1141221997. The reversal of 1141221987 is 7891221411.

It is not a de Polignac number, because 1141221987 - 2⁶ = 1141221923 is a prime.

It is a super-2 number, since 2×1141221987² = 2604775247224456338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1141221997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148893 + ... + 156369.

It is an arithmetic number, because the mean of its divisors is an integer number (105701530).

Almost surely, 2^1141221987 is an apocalyptic number.

1141221987 is a deficient number, since it is larger than the sum of its proper divisors (550002493).

1141221987 is an equidigital number, since it uses as much as digits as its factorization.

1141221987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13139 (or 13133 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1141221987 is about 33781.9772511912. The cubic root of 1141221987 is about 1045.0170512240.

The spelling of 1141221987 in words is "one billion, one hundred forty-one million, two hundred twenty-one thousand, nine hundred eighty-seven".