61909156 has 12 divisors (see below), whose sum is σ = 108406620. Its totient is φ = 30935840.

The previous prime is 61909153. The next prime is 61909157. The reversal of 61909156 is 65190916.

It can be written as a sum of positive squares in 2 ways, for example, as 60840000 + 1069156 = 7800^2 + 1034^2 .

It is not an unprimeable number, because it can be changed into a prime (61909151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4950 + ... + 12178.

It is an arithmetic number, because the mean of its divisors is an integer number (9033885).

Almost surely, 2^61909156 is an apocalyptic number.

It is an amenable number.

61909156 is a deficient number, since it is larger than the sum of its proper divisors (46497464).

61909156 is a wasteful number, since it uses less digits than its factorization.

61909156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9374 (or 9372 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 61909156 is about 7868.2371596184. The cubic root of 61909156 is about 395.5957596475.

The spelling of 61909156 in words is "sixty-one million, nine hundred nine thousand, one hundred fifty-six".