61155497 has 8 divisors (see below), whose sum is σ = 65979144. Its totient is φ = 56348928.

The previous prime is 61155491. The next prime is 61155499. The reversal of 61155497 is 79455116.

It can be written as a sum of positive squares in 4 ways, for example, as 1263376 + 59892121 = 1124^2 + 7739^2 .

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 61155497 - 2¹⁶ = 61089961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61155497.

It is not an unprimeable number, because it can be changed into a prime (61155491) 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, 3743 + ... + 11675.

It is an arithmetic number, because the mean of its divisors is an integer number (8247393).

Almost surely, 2^61155497 is an apocalyptic number.

It is an amenable number.

61155497 is a deficient number, since it is larger than the sum of its proper divisors (4823647).

61155497 is a wasteful number, since it uses less digits than its factorization.

61155497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8539.

The product of its digits is 37800, while the sum is 38.

The square root of 61155497 is about 7820.1980153958. The cubic root of 61155497 is about 393.9839227466.

The spelling of 61155497 in words is "sixty-one million, one hundred fifty-five thousand, four hundred ninety-seven".