61581374 has 8 divisors (see below), whose sum is σ = 94337568. Its totient is φ = 30135520.

The previous prime is 61581349. The next prime is 61581379. The reversal of 61581374 is 47318516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61581379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327467 + ... + 327654.

It is an arithmetic number, because the mean of its divisors is an integer number (11792196).

Almost surely, 2^61581374 is an apocalyptic number.

61581374 is a deficient number, since it is larger than the sum of its proper divisors (32756194).

61581374 is a wasteful number, since it uses less digits than its factorization.

61581374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655170.

The product of its digits is 20160, while the sum is 35.

The square root of 61581374 is about 7847.3800723554. The cubic root of 61581374 is about 394.8963547967.

It can be divided in two parts, 615 and 81374, that multiplied together give a triangular number (50045010 = T₁₀₀₀₄).

The spelling of 61581374 in words is "sixty-one million, five hundred eighty-one thousand, three hundred seventy-four".