61157947 has 8 divisors (see below), whose sum is σ = 63276032. Its totient is φ = 59049000.

The previous prime is 61157933. The next prime is 61157963. The reversal of 61157947 is 74975116.

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 61157947 - 2¹⁵ = 61125179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61157917) 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, 13072 + ... + 17122.

It is an arithmetic number, because the mean of its divisors is an integer number (7909504).

Almost surely, 2^61157947 is an apocalyptic number.

61157947 is a deficient number, since it is larger than the sum of its proper divisors (2118085).

61157947 is a wasteful number, since it uses less digits than its factorization.

61157947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569.

The product of its digits is 52920, while the sum is 40.

The square root of 61157947 is about 7820.3546594768. The cubic root of 61157947 is about 393.9891839129.

The spelling of 61157947 in words is "sixty-one million, one hundred fifty-seven thousand, nine hundred forty-seven".