61019091 has 12 divisors (see below), whose sum is σ = 100730032. Its totient is φ = 34868016.

The previous prime is 61019087. The next prime is 61019099. The reversal of 61019091 is 19091016.

It is not a de Polignac number, because 61019091 - 2² = 61019087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61019099) 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, 484216 + ... + 484341.

Almost surely, 2^61019091 is an apocalyptic number.

61019091 is a deficient number, since it is larger than the sum of its proper divisors (39710941).

61019091 is a wasteful number, since it uses less digits than its factorization.

61019091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968570 (or 968567 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 61019091 is about 7811.4717563338. The cubic root of 61019091 is about 393.6907805119.

It can be divided in two parts, 610 and 19091, that added together give a triangular number (19701 = T₁₉₈).

The spelling of 61019091 in words is "sixty-one million, nineteen thousand, ninety-one".