1015401561 has 4 divisors (see below), whose sum is σ = 1353868752. Its totient is φ = 676934372.

The previous prime is 1015401523. The next prime is 1015401571. The reversal of 1015401561 is 1651045101.

1015401561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1651045101 = 3 ⋅550348367.

It is a cyclic number.

It is not a de Polignac number, because 1015401561 - 2⁷ = 1015401433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1015401521) 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, 169233591 + ... + 169233596.

It is an arithmetic number, because the mean of its divisors is an integer number (338467188).

Almost surely, 2^1015401561 is an apocalyptic number.

It is an amenable number.

1015401561 is a deficient number, since it is larger than the sum of its proper divisors (338467191).

1015401561 is an equidigital number, since it uses as much as digits as its factorization.

1015401561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338467190.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 1015401561 is about 31865.3661676749. The cubic root of 1015401561 is about 1005.1077204405.

Adding to 1015401561 its reverse (1651045101), we get a palindrome (2666446662).

The spelling of 1015401561 in words is "one billion, fifteen million, four hundred one thousand, five hundred sixty-one".