61209069 has 4 divisors (see below), whose sum is σ = 81612096. Its totient is φ = 40806044.

The previous prime is 61208999. The next prime is 61209073. The reversal of 61209069 is 96090216.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 61209069 - 2⁸ = 61208813 is a prime.

It is a super-2 number, since 2×61209069² = 7493100255693522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61209079) 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, 10201509 + ... + 10201514.

It is an arithmetic number, because the mean of its divisors is an integer number (20403024).

Almost surely, 2^61209069 is an apocalyptic number.

It is an amenable number.

61209069 is a deficient number, since it is larger than the sum of its proper divisors (20403027).

61209069 is a wasteful number, since it uses less digits than its factorization.

61209069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20403026.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 61209069 is about 7823.6224985616. The cubic root of 61209069 is about 394.0989320135.

The spelling of 61209069 in words is "sixty-one million, two hundred nine thousand, sixty-nine".