61678091 has 12 divisors (see below), whose sum is σ = 65803608. Its totient is φ = 57798912.

The previous prime is 61678087. The next prime is 61678109. The reversal of 61678091 is 19087616.

It is not a de Polignac number, because 61678091 - 2² = 61678087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61678031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131840 + ... + 132306.

It is an arithmetic number, because the mean of its divisors is an integer number (5483634).

Almost surely, 2^61678091 is an apocalyptic number.

61678091 is a deficient number, since it is larger than the sum of its proper divisors (4125517).

61678091 is a wasteful number, since it uses less digits than its factorization.

61678091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958 (or 941 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 61678091 is about 7853.5400298209. The cubic root of 61678091 is about 395.1029822818.

The spelling of 61678091 in words is "sixty-one million, six hundred seventy-eight thousand, ninety-one".