1561371401 has 8 divisors (see below), whose sum is σ = 1575045120. Its totient is φ = 1547719488.

The previous prime is 1561371373. The next prime is 1561371403. The reversal of 1561371401 is 1041731651.

It is a happy number.

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 1561371401 - 2⁶ = 1561371337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561371403) 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, 159980 + ... + 169458.

It is an arithmetic number, because the mean of its divisors is an integer number (196880640).

Almost surely, 2^1561371401 is an apocalyptic number.

It is an amenable number.

1561371401 is a deficient number, since it is larger than the sum of its proper divisors (13673719).

1561371401 is a wasteful number, since it uses less digits than its factorization.

1561371401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10903.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 1561371401 is about 39514.1923996936. The cubic root of 1561371401 is about 1160.1177548415.

The spelling of 1561371401 in words is "one billion, five hundred sixty-one million, three hundred seventy-one thousand, four hundred one".