145851987 has 4 divisors (see below), whose sum is σ = 194469320. Its totient is φ = 97234656.

The previous prime is 145851983. The next prime is 145851989. The reversal of 145851987 is 789158541.

It is a happy number.

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

It is not a de Polignac number, because 145851987 - 2² = 145851983 is a prime.

It is a super-2 number, since 2×145851987² = 42545604223696338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145851983) 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, 24308662 + ... + 24308667.

It is an arithmetic number, because the mean of its divisors is an integer number (48617330).

Almost surely, 2^145851987 is an apocalyptic number.

145851987 is a deficient number, since it is larger than the sum of its proper divisors (48617333).

145851987 is an equidigital number, since it uses as much as digits as its factorization.

145851987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48617332.

The product of its digits is 403200, while the sum is 48.

The square root of 145851987 is about 12076.9195989706. The cubic root of 145851987 is about 526.3857413748.

The spelling of 145851987 in words is "one hundred forty-five million, eight hundred fifty-one thousand, nine hundred eighty-seven".