1725561261 has 12 divisors (see below), whose sum is σ = 2493268960. Its totient is φ = 1150008840.

The previous prime is 1725561239. The next prime is 1725561307. The reversal of 1725561261 is 1621655271.

1725561261 is a `hidden beast` number, since 1 + 72 + 5 + 561 + 26 + 1 = 666.

It is not a de Polignac number, because 1725561261 - 2⁶ = 1725561197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1725561661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1200 + ... + 58758.

Almost surely, 2^1725561261 is an apocalyptic number.

It is an amenable number.

1725561261 is a deficient number, since it is larger than the sum of its proper divisors (767707699).

1725561261 is a wasteful number, since it uses less digits than its factorization.

1725561261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60896 (or 60893 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 1725561261 is about 41539.8755534968. The cubic root of 1725561261 is about 1199.4352113031.

The spelling of 1725561261 in words is "one billion, seven hundred twenty-five million, five hundred sixty-one thousand, two hundred sixty-one".