61087919 has 4 divisors (see below), whose sum is σ = 64681344. Its totient is φ = 57494496.

The previous prime is 61087883. The next prime is 61087937. The reversal of 61087919 is 91978016.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61087919 - 2¹² = 61083823 is a prime.

It is a super-2 number, since 2×61087919² = 7463467695501122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61087519) 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, 1796687 + ... + 1796720.

It is an arithmetic number, because the mean of its divisors is an integer number (16170336).

Almost surely, 2^61087919 is an apocalyptic number.

61087919 is a deficient number, since it is larger than the sum of its proper divisors (3593425).

61087919 is a wasteful number, since it uses less digits than its factorization.

61087919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593424.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 61087919 is about 7815.8760865305. The cubic root of 61087919 is about 393.8387493238.

The spelling of 61087919 in words is "sixty-one million, eighty-seven thousand, nine hundred nineteen".