61091000 has 32 divisors (see below), whose sum is σ = 142955280. Its totient is φ = 24436000.

The previous prime is 61090973. The next prime is 61091039. The reversal of 61091000 is 19016.

It is a super-2 number, since 2×61091000² = 7464220562000000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61091000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29546 + ... + 31545.

Almost surely, 2^61091000 is an apocalyptic number.

It is an amenable number.

61091000 is an abundant number, since it is smaller than the sum of its proper divisors (81864280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61091000 is a wasteful number, since it uses less digits than its factorization.

61091000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61112 (or 61098 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 61091000 is about 7816.0731828713. The cubic root of 61091000 is about 393.8453703645.

The spelling of 61091000 in words is "sixty-one million, ninety-one thousand".