61572017 has 8 divisors (see below), whose sum is σ = 68595240. Its totient is φ = 54875520.

The previous prime is 61571999. The next prime is 61572019. The reversal of 61572017 is 71027516.

It can be written as a sum of positive squares in 4 ways, for example, as 43681 + 61528336 = 209^2 + 7844^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61572017 - 2¹² = 61567921 is a prime.

It is a super-2 number, since 2×61572017² = 7582226554896578, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61572019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81284 + ... + 82037.

It is an arithmetic number, because the mean of its divisors is an integer number (8574405).

Almost surely, 2^61572017 is an apocalyptic number.

It is an amenable number.

61572017 is a deficient number, since it is larger than the sum of its proper divisors (7023223).

61572017 is a wasteful number, since it uses less digits than its factorization.

61572017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163363.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 61572017 is about 7846.7838634692. The cubic root of 61572017 is about 394.8763529026.

The spelling of 61572017 in words is "sixty-one million, five hundred seventy-two thousand, seventeen".