61163399 has 16 divisors (see below), whose sum is σ = 70917120. Its totient is φ = 52133760.

The previous prime is 61163393. The next prime is 61163423. The reversal of 61163399 is 99336116.

It is a cyclic number.

It is not a de Polignac number, because 61163399 - 2⁴ = 61163383 is a prime.

It is a super-2 number, since 2×61163399² = 7481922754466402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61163393) 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, 70442 + ... + 71304.

It is an arithmetic number, because the mean of its divisors is an integer number (4432320).

Almost surely, 2^61163399 is an apocalyptic number.

61163399 is a deficient number, since it is larger than the sum of its proper divisors (9753721).

61163399 is a wasteful number, since it uses less digits than its factorization.

61163399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270.

The product of its digits is 26244, while the sum is 38.

The square root of 61163399 is about 7820.7032292499. The cubic root of 61163399 is about 394.0008911143. Note that the first 3 decimals are identical.

The spelling of 61163399 in words is "sixty-one million, one hundred sixty-three thousand, three hundred ninety-nine".