1561029401 has 8 divisors (see below), whose sum is σ = 1569091680. Its totient is φ = 1552979232.

The previous prime is 1561029373. The next prime is 1561029409. The reversal of 1561029401 is 1049201651.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561029401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1561029409) 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, 365786 + ... + 370028.

It is an arithmetic number, because the mean of its divisors is an integer number (196136460).

Almost surely, 2^1561029401 is an apocalyptic number.

It is an amenable number.

1561029401 is a deficient number, since it is larger than the sum of its proper divisors (8062279).

1561029401 is a wasteful number, since it uses less digits than its factorization.

1561029401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6055.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1561029401 is about 39509.8646036658. The cubic root of 1561029401 is about 1160.0330452834.

The spelling of 1561029401 in words is "one billion, five hundred sixty-one million, twenty-nine thousand, four hundred one".