1541748561 has 4 divisors (see below), whose sum is σ = 2055664752. Its totient is φ = 1027832372.

The previous prime is 1541748553. The next prime is 1541748569. The reversal of 1541748561 is 1658471451.

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 an interprime number because it is at equal distance from previous prime (1541748553) and next prime (1541748569).

It is a cyclic number.

It is not a de Polignac number, because 1541748561 - 2³ = 1541748553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1541748569) 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, 256958091 + ... + 256958096.

It is an arithmetic number, because the mean of its divisors is an integer number (513916188).

Almost surely, 2^1541748561 is an apocalyptic number.

It is an amenable number.

1541748561 is a deficient number, since it is larger than the sum of its proper divisors (513916191).

1541748561 is an equidigital number, since it uses as much as digits as its factorization.

1541748561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513916190.

The product of its digits is 134400, while the sum is 42.

The square root of 1541748561 is about 39265.1061503722. The cubic root of 1541748561 is about 1155.2372496644.

It can be divided in two parts, 154174 and 8561, that added together give a triangular number (162735 = T₅₇₀).

The spelling of 1541748561 in words is "one billion, five hundred forty-one million, seven hundred forty-eight thousand, five hundred sixty-one".