1531420561 has 16 divisors (see below), whose sum is σ = 1721720448. Its totient is φ = 1350044800.

The previous prime is 1531420559. The next prime is 1531420567. The reversal of 1531420561 is 1650241351.

It is a cyclic number.

It is not a de Polignac number, because 1531420561 - 2¹ = 1531420559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1531420567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65151 + ... + 85483.

It is an arithmetic number, because the mean of its divisors is an integer number (107607528).

Almost surely, 2^1531420561 is an apocalyptic number.

1531420561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1531420561 is a deficient number, since it is larger than the sum of its proper divisors (190299887).

1531420561 is a wasteful number, since it uses less digits than its factorization.

1531420561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20552.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1531420561 is about 39133.3688940781. The cubic root of 1531420561 is about 1152.6518665618.

The spelling of 1531420561 in words is "one billion, five hundred thirty-one million, four hundred twenty thousand, five hundred sixty-one".