1254652561 has 4 divisors (see below), whose sum is σ = 1255055652. Its totient is φ = 1254249472.

The previous prime is 1254652489. The next prime is 1254652583. The reversal of 1254652561 is 1652564521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1652564521 = 5669 ⋅291509.

It can be written as a sum of positive squares in 2 ways, for example, as 1250966161 + 3686400 = 35369^2 + 1920^2 .

It is a cyclic number.

It is not a de Polignac number, because 1254652561 - 2¹¹ = 1254650513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1254652561.

It is not an unprimeable number, because it can be changed into a prime (1254652261) 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, 196840 + ... + 203113.

It is an arithmetic number, because the mean of its divisors is an integer number (313763913).

Almost surely, 2^1254652561 is an apocalyptic number.

It is an amenable number.

1254652561 is a deficient number, since it is larger than the sum of its proper divisors (403091).

1254652561 is an equidigital number, since it uses as much as digits as its factorization.

1254652561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403090.

The product of its digits is 72000, while the sum is 37.

The square root of 1254652561 is about 35421.0750966144. The cubic root of 1254652561 is about 1078.5521754573.

The spelling of 1254652561 in words is "one billion, two hundred fifty-four million, six hundred fifty-two thousand, five hundred sixty-one".