1155142501 has 4 divisors (see below), whose sum is σ = 1205366112. Its totient is φ = 1104918892.

The previous prime is 1155142493. The next prime is 1155142519. The reversal of 1155142501 is 1052415511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1155142501 - 2³ = 1155142493 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 (1155142561) 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, 25111771 + ... + 25111816.

It is an arithmetic number, because the mean of its divisors is an integer number (301341528).

Almost surely, 2^1155142501 is an apocalyptic number.

It is an amenable number.

1155142501 is a deficient number, since it is larger than the sum of its proper divisors (50223611).

1155142501 is an equidigital number, since it uses as much as digits as its factorization.

1155142501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50223610.

The product of its (nonzero) digits is 1000, while the sum is 25.

The square root of 1155142501 is about 33987.3873812036. The cubic root of 1155142501 is about 1049.2488962448.

The spelling of 1155142501 in words is "one billion, one hundred fifty-five million, one hundred forty-two thousand, five hundred one".