61197511 has 4 divisors (see below), whose sum is σ = 63307800. Its totient is φ = 59087224.

The previous prime is 61197481. The next prime is 61197529. The reversal of 61197511 is 11579116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61197511 - 2⁹ = 61196999 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61197541) 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, 1055101 + ... + 1055158.

It is an arithmetic number, because the mean of its divisors is an integer number (15826950).

Almost surely, 2^61197511 is an apocalyptic number.

61197511 is the 3499-th centered decagonal number.

61197511 is a deficient number, since it is larger than the sum of its proper divisors (2110289).

61197511 is a wasteful number, since it uses less digits than its factorization.

61197511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110288.

The product of its digits is 1890, while the sum is 31.

The square root of 61197511 is about 7822.8838033043. The cubic root of 61197511 is about 394.0741247844.

The spelling of 61197511 in words is "sixty-one million, one hundred ninety-seven thousand, five hundred eleven".