68961591 has 8 divisors (see below), whose sum is σ = 102165360. Its totient is φ = 45974376.

The previous prime is 68961539. The next prime is 68961593. The reversal of 68961591 is 19516986.

It is not a de Polignac number, because 68961591 - 2¹⁴ = 68945207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68961593) 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, 1277040 + ... + 1277093.

It is an arithmetic number, because the mean of its divisors is an integer number (12770670).

Almost surely, 2^68961591 is an apocalyptic number.

68961591 is a deficient number, since it is larger than the sum of its proper divisors (33203769).

68961591 is a wasteful number, since it uses less digits than its factorization.

68961591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554142 (or 2554136 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 68961591 is about 8304.3115909749. The cubic root of 68961591 is about 410.0804739915.

The spelling of 68961591 in words is "sixty-eight million, nine hundred sixty-one thousand, five hundred ninety-one".