261497325 has 12 divisors (see below), whose sum is σ = 432342368. Its totient is φ = 139465200.

The previous prime is 261497317. The next prime is 261497329. The reversal of 261497325 is 523794162.

It is not a de Polignac number, because 261497325 - 2³ = 261497317 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261497329) 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, 1743241 + ... + 1743390.

Almost surely, 2^261497325 is an apocalyptic number.

261497325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261497325 is a deficient number, since it is larger than the sum of its proper divisors (170845043).

261497325 is a wasteful number, since it uses less digits than its factorization.

261497325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3486644 (or 3486639 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 261497325 is about 16170.8789185993. The cubic root of 261497325 is about 639.4733012010.

The spelling of 261497325 in words is "two hundred sixty-one million, four hundred ninety-seven thousand, three hundred twenty-five".