1241505491 has 4 divisors (see below), whose sum is σ = 1241663184. Its totient is φ = 1241347800.

The previous prime is 1241505481. The next prime is 1241505493. The reversal of 1241505491 is 1945051421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1945051421 = 577 ⋅3370973.

It is a cyclic number.

It is not a de Polignac number, because 1241505491 - 2¹⁸ = 1241243347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1241505493) 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, 66380 + ... + 83001.

It is an arithmetic number, because the mean of its divisors is an integer number (310415796).

Almost surely, 2^1241505491 is an apocalyptic number.

1241505491 is a deficient number, since it is larger than the sum of its proper divisors (157693).

1241505491 is an equidigital number, since it uses as much as digits as its factorization.

1241505491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157692.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 1241505491 is about 35235.0037746557. The cubic root of 1241505491 is about 1074.7716813830.

The spelling of 1241505491 in words is "one billion, two hundred forty-one million, five hundred five thousand, four hundred ninety-one".