145621811 has 4 divisors (see below), whose sum is σ = 146012592. Its totient is φ = 145231032.

The previous prime is 145621799. The next prime is 145621831. The reversal of 145621811 is 118126541.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145621811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145621831) 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, 194831 + ... + 195576.

It is an arithmetic number, because the mean of its divisors is an integer number (36503148).

Almost surely, 2^145621811 is an apocalyptic number.

145621811 is a deficient number, since it is larger than the sum of its proper divisors (390781).

145621811 is an equidigital number, since it uses as much as digits as its factorization.

145621811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390780.

The product of its digits is 1920, while the sum is 29.

The square root of 145621811 is about 12067.3862538662. The cubic root of 145621811 is about 526.1086907390.

The spelling of 145621811 in words is "one hundred forty-five million, six hundred twenty-one thousand, eight hundred eleven".