1225551501 has 6 divisors (see below), whose sum is σ = 1770241070. Its totient is φ = 817034328.

The previous prime is 1225551499. The next prime is 1225551529. The reversal of 1225551501 is 1051555221.

It can be written as a sum of positive squares in only one way, i.e., 724955625 + 500595876 = 26925^2 + 22374^2 .

It is not a de Polignac number, because 1225551501 - 2¹ = 1225551499 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 (1225551601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68086186 + ... + 68086203.

Almost surely, 2^1225551501 is an apocalyptic number.

It is an amenable number.

1225551501 is a deficient number, since it is larger than the sum of its proper divisors (544689569).

1225551501 is a wasteful number, since it uses less digits than its factorization.

1225551501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136172395 (or 136172392 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The square root of 1225551501 is about 35007.8776991694. The cubic root of 1225551501 is about 1070.1480276760.

The spelling of 1225551501 in words is "one billion, two hundred twenty-five million, five hundred fifty-one thousand, five hundred one".