61087251 has 4 divisors (see below), whose sum is σ = 81449672. Its totient is φ = 40724832.

The previous prime is 61087249. The next prime is 61087283. The reversal of 61087251 is 15278016.

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

It is not a de Polignac number, because 61087251 - 2¹ = 61087249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61087651) 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, 10181206 + ... + 10181211.

It is an arithmetic number, because the mean of its divisors is an integer number (20362418).

Almost surely, 2^61087251 is an apocalyptic number.

61087251 is a deficient number, since it is larger than the sum of its proper divisors (20362421).

61087251 is a wasteful number, since it uses less digits than its factorization.

61087251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20362420.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 61087251 is about 7815.8333528805. The cubic root of 61087251 is about 393.8373137686.

The spelling of 61087251 in words is "sixty-one million, eighty-seven thousand, two hundred fifty-one".