261453405 has 16 divisors (see below), whose sum is σ = 418602240. Its totient is φ = 139349568.

The previous prime is 261453391. The next prime is 261453407. The reversal of 261453405 is 504354162.

It is not a de Polignac number, because 261453405 - 2⁴ = 261453389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261453407) 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, 21964 + ... + 31706.

It is an arithmetic number, because the mean of its divisors is an integer number (26162640).

Almost surely, 2^261453405 is an apocalyptic number.

It is an amenable number.

261453405 is a deficient number, since it is larger than the sum of its proper divisors (157148835).

261453405 is a wasteful number, since it uses less digits than its factorization.

261453405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11540.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 261453405 is about 16169.5208648865. The cubic root of 261453405 is about 639.4374981070.

The spelling of 261453405 in words is "two hundred sixty-one million, four hundred fifty-three thousand, four hundred five".