261445425 has 12 divisors (see below), whose sum is σ = 432256560. Its totient is φ = 139437520.

The previous prime is 261445403. The next prime is 261445427. The reversal of 261445425 is 524544162.

It is not a de Polignac number, because 261445425 - 2⁷ = 261445297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261445427) 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, 1742895 + ... + 1743044.

It is an arithmetic number, because the mean of its divisors is an integer number (36021380).

Almost surely, 2^261445425 is an apocalyptic number.

261445425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261445425 is a deficient number, since it is larger than the sum of its proper divisors (170811135).

261445425 is a wasteful number, since it uses less digits than its factorization.

261445425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485952 (or 3485947 counting only the distinct ones).

The product of its digits is 38400, while the sum is 33.

The square root of 261445425 is about 16169.2741024450. The cubic root of 261445425 is about 639.4309924696.

Adding to 261445425 its reverse (524544162), we get a palindrome (785989587).

The spelling of 261445425 in words is "two hundred sixty-one million, four hundred forty-five thousand, four hundred twenty-five".