145172551 has 2 divisors, whose sum is σ = 145172552. Its totient is φ = 145172550.

The previous prime is 145172507. The next prime is 145172563. The reversal of 145172551 is 155271541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145172551 - 2²³ = 136783943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145172501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72586275 + 72586276.

It is an arithmetic number, because the mean of its divisors is an integer number (72586276).

Almost surely, 2^145172551 is an apocalyptic number.

145172551 is a deficient number, since it is larger than the sum of its proper divisors (1).

145172551 is an equidigital number, since it uses as much as digits as its factorization.

145172551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7000, while the sum is 31.

The square root of 145172551 is about 12048.7572388193. The cubic root of 145172551 is about 525.5670981673.

The spelling of 145172551 in words is "one hundred forty-five million, one hundred seventy-two thousand, five hundred fifty-one".