261554925 has 24 divisors (see below), whose sum is σ = 432900864. Its totient is φ = 139346560.

The previous prime is 261554903. The next prime is 261554927. The reversal of 261554925 is 529455162.

It is not a de Polignac number, because 261554925 - 2⁶ = 261554861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261554927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135769 + ... + 137681.

It is an arithmetic number, because the mean of its divisors is an integer number (18037536).

Almost surely, 2^261554925 is an apocalyptic number.

261554925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261554925 is a deficient number, since it is larger than the sum of its proper divisors (171345939).

261554925 is a wasteful number, since it uses less digits than its factorization.

261554925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749 (or 3744 counting only the distinct ones).

The product of its digits is 108000, while the sum is 39.

The square root of 261554925 is about 16172.6597997979. The cubic root of 261554925 is about 639.5202500025.

The spelling of 261554925 in words is "two hundred sixty-one million, five hundred fifty-four thousand, nine hundred twenty-five".