61156947 has 4 divisors (see below), whose sum is σ = 81542600. Its totient is φ = 40771296.

The previous prime is 61156889. The next prime is 61156951. The reversal of 61156947 is 74965116.

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

It is not a de Polignac number, because 61156947 - 2¹⁰ = 61155923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61156987) 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, 10192822 + ... + 10192827.

It is an arithmetic number, because the mean of its divisors is an integer number (20385650).

Almost surely, 2^61156947 is an apocalyptic number.

61156947 is a deficient number, since it is larger than the sum of its proper divisors (20385653).

61156947 is a wasteful number, since it uses less digits than its factorization.

61156947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20385652.

The product of its digits is 45360, while the sum is 39.

The square root of 61156947 is about 7820.2907234962. The cubic root of 61156947 is about 393.9870365151.

The spelling of 61156947 in words is "sixty-one million, one hundred fifty-six thousand, nine hundred forty-seven".