61235661 has 4 divisors (see below), whose sum is σ = 81647552. Its totient is φ = 40823772.

The previous prime is 61235659. The next prime is 61235693. The reversal of 61235661 is 16653216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61235661 - 2¹ = 61235659 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 (61235611) 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, 10205941 + ... + 10205946.

It is an arithmetic number, because the mean of its divisors is an integer number (20411888).

Almost surely, 2^61235661 is an apocalyptic number.

It is an amenable number.

61235661 is a deficient number, since it is larger than the sum of its proper divisors (20411891).

61235661 is a wasteful number, since it uses less digits than its factorization.

61235661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20411890.

The product of its digits is 6480, while the sum is 30.

The square root of 61235661 is about 7825.3217825212. The cubic root of 61235661 is about 394.1559952434.

Adding to 61235661 its reverse (16653216), we get a palindrome (77888877).

The spelling of 61235661 in words is "sixty-one million, two hundred thirty-five thousand, six hundred sixty-one".