61015015 has 4 divisors (see below), whose sum is σ = 73218024. Its totient is φ = 48812008.

The previous prime is 61015013. The next prime is 61015049. The reversal of 61015015 is 51051016.

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 61015015 - 2¹ = 61015013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61014983 and 61015001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61015013) 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, 6101497 + ... + 6101506.

It is an arithmetic number, because the mean of its divisors is an integer number (18304506).

Almost surely, 2^61015015 is an apocalyptic number.

61015015 is a deficient number, since it is larger than the sum of its proper divisors (12203009).

61015015 is a wasteful number, since it uses less digits than its factorization.

61015015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12203008.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 61015015 is about 7811.2108536385. The cubic root of 61015015 is about 393.6820142972.

It can be divided in two parts, 610 and 15015, that added together give a 6-th power (15625 = 5⁶).

The spelling of 61015015 in words is "sixty-one million, fifteen thousand, fifteen".