61155944 has 8 divisors (see below), whose sum is σ = 114667410. Its totient is φ = 30577968.

The previous prime is 61155929. The next prime is 61155949. The reversal of 61155944 is 44955116.

It can be written as a sum of positive squares in only one way, i.e., 57002500 + 4153444 = 7550^2 + 2038^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×61155944² = 7480098973062272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61155949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3822239 + ... + 3822254.

Almost surely, 2^61155944 is an apocalyptic number.

It is an amenable number.

61155944 is a deficient number, since it is larger than the sum of its proper divisors (53511466).

61155944 is a wasteful number, since it uses less digits than its factorization.

61155944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7644499 (or 7644495 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 61155944 is about 7820.2265951825. The cubic root of 61155944 is about 393.9848826515.

The spelling of 61155944 in words is "sixty-one million, one hundred fifty-five thousand, nine hundred forty-four".