51015415 has 48 divisors (see below), whose sum is σ = 72049824. Its totient is φ = 34594560.

The previous prime is 51015409. The next prime is 51015421. The reversal of 51015415 is 51451015.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51015409) and next prime (51015421).

It is not a de Polignac number, because 51015415 - 2⁵ = 51015383 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 962529 + ... + 962581.

It is an arithmetic number, because the mean of its divisors is an integer number (1501038).

Almost surely, 2^51015415 is an apocalyptic number.

51015415 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51015415 is a deficient number, since it is larger than the sum of its proper divisors (21034409).

51015415 is a wasteful number, since it uses less digits than its factorization.

51015415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 51015415 is about 7142.5076128766. The cubic root of 51015415 is about 370.8803361987.

Subtracting 51015415 from its reverse (51451015), we obtain a square (435600 = 660²).

The spelling of 51015415 in words is "fifty-one million, fifteen thousand, four hundred fifteen".