61145405 has 16 divisors (see below), whose sum is σ = 74746560. Its totient is φ = 48010752.

The previous prime is 61145393. The next prime is 61145407. The reversal of 61145405 is 50454116.

It is a cyclic number.

It is not a de Polignac number, because 61145405 - 2⁴ = 61145389 is a prime.

It is a super-2 number, since 2×61145405² = 7477521105228050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61145407) 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, 66962 + ... + 67868.

It is an arithmetic number, because the mean of its divisors is an integer number (4671660).

Almost surely, 2^61145405 is an apocalyptic number.

It is an amenable number.

61145405 is a deficient number, since it is larger than the sum of its proper divisors (13601155).

61145405 is a wasteful number, since it uses less digits than its factorization.

61145405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 61145405 is about 7819.5527365700. The cubic root of 61145405 is about 393.9622495546.

It can be divided in two parts, 6 and 1145405, that added together give a palindrome (1145411).

The spelling of 61145405 in words is "sixty-one million, one hundred forty-five thousand, four hundred five".