61199591 has 4 divisors (see below), whose sum is σ = 62853672. Its totient is φ = 59545512.

The previous prime is 61199581. The next prime is 61199597. The reversal of 61199591 is 19599116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61199591 - 2¹⁰ = 61198567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61199597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826985 + ... + 827058.

It is an arithmetic number, because the mean of its divisors is an integer number (15713418).

Almost surely, 2^61199591 is an apocalyptic number.

61199591 is a deficient number, since it is larger than the sum of its proper divisors (1654081).

61199591 is a wasteful number, since it uses less digits than its factorization.

61199591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654080.

The product of its digits is 21870, while the sum is 41.

The square root of 61199591 is about 7823.0167454761. The cubic root of 61199591 is about 394.0785893718.

The spelling of 61199591 in words is "sixty-one million, one hundred ninety-nine thousand, five hundred ninety-one".