51061615 has 16 divisors (see below), whose sum is σ = 67001760. Its totient is φ = 37048320.

The previous prime is 51061613. The next prime is 51061639. The reversal of 51061615 is 51616015.

It is not a de Polignac number, because 51061615 - 2¹ = 51061613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51061615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51061613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30931 + ... + 32539.

It is an arithmetic number, because the mean of its divisors is an integer number (4187610).

Almost surely, 2^51061615 is an apocalyptic number.

51061615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51061615 is a deficient number, since it is larger than the sum of its proper divisors (15940145).

51061615 is a wasteful number, since it uses less digits than its factorization.

51061615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 51061615 is about 7145.7410392485. The cubic root of 51061615 is about 370.9922598967.

The spelling of 51061615 in words is "fifty-one million, sixty-one thousand, six hundred fifteen".