1225540536 has 32 divisors (see below), whose sum is σ = 3342384000. Its totient is φ = 371375840.

The previous prime is 1225540531. The next prime is 1225540541. The reversal of 1225540536 is 6350455221.

It is an interprime number because it is at equal distance from previous prime (1225540531) and next prime (1225540541).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 1225540497 and 1225540506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225540531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2320836 + ... + 2321363.

It is an arithmetic number, because the mean of its divisors is an integer number (104449500).

Almost surely, 2^1225540536 is an apocalyptic number.

It is an amenable number.

1225540536 is an abundant number, since it is smaller than the sum of its proper divisors (2116843464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225540536 is a wasteful number, since it uses less digits than its factorization.

1225540536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4642219 (or 4642215 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 1225540536 is about 35007.7210912107. The cubic root of 1225540536 is about 1070.1448361310.

Adding to 1225540536 its reverse (6350455221), we get a palindrome (7575995757).

The spelling of 1225540536 in words is "one billion, two hundred twenty-five million, five hundred forty thousand, five hundred thirty-six".