2251555145 has 24 divisors (see below), whose sum is σ = 3146415048. Its totient is φ = 1542240000.

The previous prime is 2251555129. The next prime is 2251555147. The reversal of 2251555145 is 5415551522.

It can be written as a sum of positive squares in 4 ways, for example, as 78783376 + 2172771769 = 8876^2 + 46613^2 .

It is not a de Polignac number, because 2251555145 - 2⁴ = 2251555129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (2251555147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 245645 + ... + 254645.

It is an arithmetic number, because the mean of its divisors is an integer number (131100627).

Almost surely, 2^2251555145 is an apocalyptic number.

It is an amenable number.

2251555145 is a deficient number, since it is larger than the sum of its proper divisors (894859903).

2251555145 is a wasteful number, since it uses less digits than its factorization.

2251555145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10041 (or 10034 counting only the distinct ones).

The product of its digits is 50000, while the sum is 35.

The square root of 2251555145 is about 47450.5547385908. The cubic root of 2251555145 is about 1310.6725263077.

The spelling of 2251555145 in words is "two billion, two hundred fifty-one million, five hundred fifty-five thousand, one hundred forty-five".