261653457 has 16 divisors (see below), whose sum is σ = 388664640. Its totient is φ = 155464512.

The previous prime is 261653453. The next prime is 261653471. The reversal of 261653457 is 754356162.

261653457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261653457 - 2² = 261653453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (261653453) 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, 114543 + ... + 116804.

It is an arithmetic number, because the mean of its divisors is an integer number (24291540).

Almost surely, 2^261653457 is an apocalyptic number.

It is an amenable number.

261653457 is a deficient number, since it is larger than the sum of its proper divisors (127011183).

261653457 is a wasteful number, since it uses less digits than its factorization.

261653457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231392.

The product of its digits is 151200, while the sum is 39.

The square root of 261653457 is about 16175.7057651281. The cubic root of 261653457 is about 639.6005458183.

The spelling of 261653457 in words is "two hundred sixty-one million, six hundred fifty-three thousand, four hundred fifty-seven".