1561120457 has 8 divisors (see below), whose sum is σ = 1683251136. Its totient is φ = 1439281872.

The previous prime is 1561120439. The next prime is 1561120499. The reversal of 1561120457 is 7540211651.

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 1561120457 - 2¹⁶ = 1561054921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561120657) 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, 61853 + ... + 83354.

It is an arithmetic number, because the mean of its divisors is an integer number (210406392).

Almost surely, 2^1561120457 is an apocalyptic number.

It is an amenable number.

1561120457 is a deficient number, since it is larger than the sum of its proper divisors (122130679).

1561120457 is a wasteful number, since it uses less digits than its factorization.

1561120457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146047.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 1561120457 is about 39511.0169066806. The cubic root of 1561120457 is about 1160.0556000401.

The spelling of 1561120457 in words is "one billion, five hundred sixty-one million, one hundred twenty thousand, four hundred fifty-seven".