61908291 has 6 divisors (see below), whose sum is σ = 89423100. Its totient is φ = 41272188.

The previous prime is 61908283. The next prime is 61908299. The reversal of 61908291 is 19280916.

It is an interprime number because it is at equal distance from previous prime (61908283) and next prime (61908299).

It is not a de Polignac number, because 61908291 - 2³ = 61908283 is a prime.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (61908299) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3439341 + ... + 3439358.

It is an arithmetic number, because the mean of its divisors is an integer number (14903850).

Almost surely, 2^61908291 is an apocalyptic number.

61908291 is a deficient number, since it is larger than the sum of its proper divisors (27514809).

61908291 is a wasteful number, since it uses less digits than its factorization.

61908291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6878705 (or 6878702 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 61908291 is about 7868.1821915866. The cubic root of 61908291 is about 395.5939172064.

The spelling of 61908291 in words is "sixty-one million, nine hundred eight thousand, two hundred ninety-one".