61261191 has 20 divisors (see below), whose sum is σ = 91760592. Its totient is φ = 40730688.

The previous prime is 61261169. The next prime is 61261199. The reversal of 61261191 is 19116216.

It is not a de Polignac number, because 61261191 - 2⁷ = 61261063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61261199) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 38671 + ... + 40223.

Almost surely, 2^61261191 is an apocalyptic number.

61261191 is a deficient number, since it is larger than the sum of its proper divisors (30499401).

61261191 is a wasteful number, since it uses less digits than its factorization.

61261191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052 (or 2043 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 61261191 is about 7826.9528553582. The cubic root of 61261191 is about 394.2107640076.

The spelling of 61261191 in words is "sixty-one million, two hundred sixty-one thousand, one hundred ninety-one".