1205641501 has 4 divisors (see below), whose sum is σ = 1222157212. Its totient is φ = 1189125792.

The previous prime is 1205641499. The next prime is 1205641517. The reversal of 1205641501 is 1051465021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 904445476 + 301196025 = 30074^2 + 17355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205641501 - 2¹ = 1205641499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205641201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8257746 + ... + 8257891.

It is an arithmetic number, because the mean of its divisors is an integer number (305539303).

Almost surely, 2^1205641501 is an apocalyptic number.

It is an amenable number.

1205641501 is a deficient number, since it is larger than the sum of its proper divisors (16515711).

1205641501 is an equidigital number, since it uses as much as digits as its factorization.

1205641501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16515710.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1205641501 is about 34722.3487252807. The cubic root of 1205641501 is about 1064.3212411802.

The spelling of 1205641501 in words is "one billion, two hundred five million, six hundred forty-one thousand, five hundred one".