61157121 has 8 divisors (see below), whose sum is σ = 81834144. Its totient is φ = 40625760.

The previous prime is 61157119. The next prime is 61157147. The reversal of 61157121 is 12175116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61157121 - 2¹ = 61157119 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61157091 and 61157100.

It is not an unprimeable number, because it can be changed into a prime (61157191) 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, 35431 + ... + 37116.

It is an arithmetic number, because the mean of its divisors is an integer number (10229268).

Almost surely, 2^61157121 is an apocalyptic number.

It is an amenable number.

61157121 is a deficient number, since it is larger than the sum of its proper divisors (20677023).

61157121 is a wasteful number, since it uses less digits than its factorization.

61157121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72831.

The product of its digits is 420, while the sum is 24.

The square root of 61157121 is about 7820.3018483943. The cubic root of 61157121 is about 393.9874101640.

The spelling of 61157121 in words is "sixty-one million, one hundred fifty-seven thousand, one hundred twenty-one".