261379497 has 8 divisors (see below), whose sum is σ = 349606656. Its totient is φ = 173702672.

The previous prime is 261379483. The next prime is 261379501. The reversal of 261379497 is 794973162.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261379497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261379427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136473 + ... + 138374.

It is an arithmetic number, because the mean of its divisors is an integer number (43700832).

Almost surely, 2^261379497 is an apocalyptic number.

It is an amenable number.

261379497 is a deficient number, since it is larger than the sum of its proper divisors (88227159).

261379497 is a wasteful number, since it uses less digits than its factorization.

261379497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275167.

The product of its digits is 571536, while the sum is 48.

The square root of 261379497 is about 16167.2352924054. The cubic root of 261379497 is about 639.3772400782.

The spelling of 261379497 in words is "two hundred sixty-one million, three hundred seventy-nine thousand, four hundred ninety-seven".