61231157 has 8 divisors (see below), whose sum is σ = 66051384. Its totient is φ = 56426688.

The previous prime is 61231141. The next prime is 61231187. The reversal of 61231157 is 75113216.

It can be written as a sum of positive squares in 4 ways, for example, as 3334276 + 57896881 = 1826^2 + 7609^2 .

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 61231157 - 2⁴ = 61231141 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 (61231187) 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, 4883 + ... + 12095.

It is an arithmetic number, because the mean of its divisors is an integer number (8256423).

Almost surely, 2^61231157 is an apocalyptic number.

It is an amenable number.

61231157 is a deficient number, since it is larger than the sum of its proper divisors (4820227).

61231157 is a wasteful number, since it uses less digits than its factorization.

61231157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7879.

The product of its digits is 1260, while the sum is 26.

The square root of 61231157 is about 7825.0339935364. The cubic root of 61231157 is about 394.1463313640.

The spelling of 61231157 in words is "sixty-one million, two hundred thirty-one thousand, one hundred fifty-seven".