1225646501 has 16 divisors (see below), whose sum is σ = 1342915200. Its totient is φ = 1114003968.

The previous prime is 1225646491. The next prime is 1225646531. The reversal of 1225646501 is 1056465221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225646501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225646531) 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, 55640 + ... + 74478.

It is an arithmetic number, because the mean of its divisors is an integer number (83932200).

Almost surely, 2^1225646501 is an apocalyptic number.

It is an amenable number.

1225646501 is a deficient number, since it is larger than the sum of its proper divisors (117268699).

1225646501 is a wasteful number, since it uses less digits than its factorization.

1225646501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18988.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1225646501 is about 35009.2345103403. The cubic root of 1225646501 is about 1070.1756782033.

The spelling of 1225646501 in words is "one billion, two hundred twenty-five million, six hundred forty-six thousand, five hundred one".