61039979 has 48 divisors (see below), whose sum is σ = 87472896. Its totient is φ = 41126400.

The previous prime is 61039967. The next prime is 61039991. The reversal of 61039979 is 97993016.

61039979 = 1232² + 1233² + ... + 1270².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61039967) and next prime (61039991).

It is not a de Polignac number, because 61039979 - 2¹² = 61035883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61039949) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 289184 + ... + 289394.

It is an arithmetic number, because the mean of its divisors is an integer number (1822352).

Almost surely, 2^61039979 is an apocalyptic number.

61039979 is a deficient number, since it is larger than the sum of its proper divisors (26432917).

61039979 is a wasteful number, since it uses less digits than its factorization.

61039979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 61039979 is about 7812.8086499031. The cubic root of 61039979 is about 393.7356980108.

The spelling of 61039979 in words is "sixty-one million, thirty-nine thousand, nine hundred seventy-nine".