61307157 has 4 divisors (see below), whose sum is σ = 81742880. Its totient is φ = 40871436.

The previous prime is 61307143. The next prime is 61307161. The reversal of 61307157 is 75170316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-61307157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61307657) 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, 10217857 + ... + 10217862.

It is an arithmetic number, because the mean of its divisors is an integer number (20435720).

Almost surely, 2^61307157 is an apocalyptic number.

It is an amenable number.

61307157 is a deficient number, since it is larger than the sum of its proper divisors (20435723).

61307157 is a wasteful number, since it uses less digits than its factorization.

61307157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20435722.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 61307157 is about 7829.8886965269. Note that the first 3 decimals coincide. The cubic root of 61307157 is about 394.3093351776.

The spelling of 61307157 in words is "sixty-one million, three hundred seven thousand, one hundred fifty-seven".