15515253 has 16 divisors (see below), whose sum is σ = 24754240. Its totient is φ = 9547632.

The previous prime is 15515251. The next prime is 15515287. The reversal of 15515253 is 35251551.

It is not a de Polignac number, because 15515253 - 2¹ = 15515251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15515251) 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, 21751 + ... + 22452.

It is an arithmetic number, because the mean of its divisors is an integer number (1547140).

Almost surely, 2^15515253 is an apocalyptic number.

15515253 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

15515253 is a deficient number, since it is larger than the sum of its proper divisors (9238987).

15515253 is a wasteful number, since it uses less digits than its factorization.

15515253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44225 (or 44219 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 15515253 is about 3938.9405936114. The cubic root of 15515253 is about 249.4133069086.

The spelling of 15515253 in words is "fifteen million, five hundred fifteen thousand, two hundred fifty-three".