1561402601 has 16 divisors (see below), whose sum is σ = 1767018240. Its totient is φ = 1366673280.

The previous prime is 1561402597. The next prime is 1561402603. The reversal of 1561402601 is 1062041651.

It is a cyclic number.

It is not a de Polignac number, because 1561402601 - 2² = 1561402597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561402603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110405 + ... + 123741.

It is an arithmetic number, because the mean of its divisors is an integer number (110438640).

Almost surely, 2^1561402601 is an apocalyptic number.

1561402601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1561402601 is a deficient number, since it is larger than the sum of its proper divisors (205615639).

1561402601 is a wasteful number, since it uses less digits than its factorization.

1561402601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13744.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1561402601 is about 39514.5871925799. The cubic root of 1561402601 is about 1160.1254821152.

The spelling of 1561402601 in words is "one billion, five hundred sixty-one million, four hundred two thousand, six hundred one".