61689291 has 4 divisors (see below), whose sum is σ = 82252392. Its totient is φ = 41126192.

The previous prime is 61689281. The next prime is 61689317. The reversal of 61689291 is 19298616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61689291 - 2⁵ = 61689259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61689281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10281546 + ... + 10281551.

It is an arithmetic number, because the mean of its divisors is an integer number (20563098).

Almost surely, 2^61689291 is an apocalyptic number.

61689291 is a deficient number, since it is larger than the sum of its proper divisors (20563101).

61689291 is a wasteful number, since it uses less digits than its factorization.

61689291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20563100.

The product of its digits is 46656, while the sum is 42.

The square root of 61689291 is about 7854.2530516912. The cubic root of 61689291 is about 395.1268961520.

The spelling of 61689291 in words is "sixty-one million, six hundred eighty-nine thousand, two hundred ninety-one".