61217949 has 16 divisors (see below), whose sum is σ = 88206272. Its totient is φ = 37542528.

The previous prime is 61217941. The next prime is 61217957. The reversal of 61217949 is 94971216.

It is an interprime number because it is at equal distance from previous prime (61217941) and next prime (61217957).

It is not a de Polignac number, because 61217949 - 2³ = 61217941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61217941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9417 + ... + 14529.

It is an arithmetic number, because the mean of its divisors is an integer number (5512892).

Almost surely, 2^61217949 is an apocalyptic number.

It is an amenable number.

61217949 is a deficient number, since it is larger than the sum of its proper divisors (26988323).

61217949 is a wasteful number, since it uses less digits than its factorization.

61217949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5436.

The product of its digits is 27216, while the sum is 39.

The square root of 61217949 is about 7824.1899900245. The cubic root of 61217949 is about 394.1179892619.

The spelling of 61217949 in words is "sixty-one million, two hundred seventeen thousand, nine hundred forty-nine".