1211042541 has 4 divisors (see below), whose sum is σ = 1614723392. Its totient is φ = 807361692.

The previous prime is 1211042537. The next prime is 1211042603. The reversal of 1211042541 is 1452401121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1211042541 - 2² = 1211042537 is a prime.

It is a super-2 number, since 2×1211042541² = 2933248072223473362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211042531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201840421 + ... + 201840426.

It is an arithmetic number, because the mean of its divisors is an integer number (403680848).

Almost surely, 2^1211042541 is an apocalyptic number.

It is an amenable number.

1211042541 is a deficient number, since it is larger than the sum of its proper divisors (403680851).

1211042541 is an equidigital number, since it uses as much as digits as its factorization.

1211042541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403680850.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1211042541 is about 34800.0365086015. The cubic root of 1211042541 is about 1065.9081913430.

Adding to 1211042541 its reverse (1452401121), we get a palindrome (2663443662).

The spelling of 1211042541 in words is "one billion, two hundred eleven million, forty-two thousand, five hundred forty-one".