1045621561 has 8 divisors (see below), whose sum is σ = 1095145920. Its totient is φ = 996435792.

The previous prime is 1045621543. The next prime is 1045621571. The reversal of 1045621561 is 1651265401.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1045621561 - 2⁵ = 1045621529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1045621501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78315 + ... + 90688.

It is an arithmetic number, because the mean of its divisors is an integer number (136893240).

Almost surely, 2^1045621561 is an apocalyptic number.

It is an amenable number.

1045621561 is a deficient number, since it is larger than the sum of its proper divisors (49524359).

1045621561 is a wasteful number, since it uses less digits than its factorization.

1045621561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169295.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1045621561 is about 32336.0721331457. The cubic root of 1045621561 is about 1014.9816172749.

Adding to 1045621561 its reverse (1651265401), we get a palindrome (2696886962).

The spelling of 1045621561 in words is "one billion, forty-five million, six hundred twenty-one thousand, five hundred sixty-one".