1561126415 has 16 divisors (see below), whose sum is σ = 1882293600. Its totient is φ = 1242957312.

The previous prime is 1561126409. The next prime is 1561126433. The reversal of 1561126415 is 5146211651.

It is a cyclic number.

It is not a de Polignac number, because 1561126415 - 2⁶ = 1561126351 is a prime.

It is a super-2 number, since 2×1561126415² = 4874231367221504450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1510739 + ... + 1511771.

It is an arithmetic number, because the mean of its divisors is an integer number (117643350).

Almost surely, 2^1561126415 is an apocalyptic number.

1561126415 is a deficient number, since it is larger than the sum of its proper divisors (321167185).

1561126415 is a wasteful number, since it uses less digits than its factorization.

1561126415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186.

The product of its digits is 7200, while the sum is 32.

The square root of 1561126415 is about 39511.0923033014. The cubic root of 1561126415 is about 1160.0570758183.

The spelling of 1561126415 in words is "one billion, five hundred sixty-one million, one hundred twenty-six thousand, four hundred fifteen".