145377521 has 2 divisors, whose sum is σ = 145377522. Its totient is φ = 145377520.

The previous prime is 145377509. The next prime is 145377527. The reversal of 145377521 is 125773541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134560000 + 10817521 = 11600^2 + 3289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145377521 is a prime.

It is a super-2 number, since 2×145377521² = 42269247224210882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145377527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72688760 + 72688761.

It is an arithmetic number, because the mean of its divisors is an integer number (72688761).

Almost surely, 2^145377521 is an apocalyptic number.

It is an amenable number.

145377521 is a deficient number, since it is larger than the sum of its proper divisors (1).

145377521 is an equidigital number, since it uses as much as digits as its factorization.

145377521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29400, while the sum is 35.

The square root of 145377521 is about 12057.2600950631. The cubic root of 145377521 is about 525.8143322982.

The spelling of 145377521 in words is "one hundred forty-five million, three hundred seventy-seven thousand, five hundred twenty-one".