261493953 has 8 divisors (see below), whose sum is σ = 398467008. Its totient is φ = 149425104.

The previous prime is 261493951. The next prime is 261493993. The reversal of 261493953 is 359394162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261493953 - 2¹ = 261493951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261493951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6226026 + ... + 6226067.

It is an arithmetic number, because the mean of its divisors is an integer number (49808376).

Almost surely, 2^261493953 is an apocalyptic number.

It is an amenable number.

261493953 is a deficient number, since it is larger than the sum of its proper divisors (136973055).

261493953 is a wasteful number, since it uses less digits than its factorization.

261493953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12452103.

The product of its digits is 174960, while the sum is 42.

The square root of 261493953 is about 16170.7746567689. The cubic root of 261493953 is about 639.4705525263.

The spelling of 261493953 in words is "two hundred sixty-one million, four hundred ninety-three thousand, nine hundred fifty-three".