261453494 has 8 divisors (see below), whose sum is σ = 393864120. Its totient is φ = 130165456.

The previous prime is 261453487. The next prime is 261453541. The reversal of 261453494 is 494354162.

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

It is a super-3 number, since 3×261453494³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280064 + ... + 280995.

It is an arithmetic number, because the mean of its divisors is an integer number (49233015).

Almost surely, 2^261453494 is an apocalyptic number.

261453494 is a deficient number, since it is larger than the sum of its proper divisors (132410626).

261453494 is a wasteful number, since it uses less digits than its factorization.

261453494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561294.

The product of its digits is 103680, while the sum is 38.

The square root of 261453494 is about 16169.5236169777. The cubic root of 261453494 is about 639.4375706629.

The spelling of 261453494 in words is "two hundred sixty-one million, four hundred fifty-three thousand, four hundred ninety-four".