149143721 has 2 divisors, whose sum is σ = 149143722. Its totient is φ = 149143720.

The previous prime is 149143699. The next prime is 149143727. The reversal of 149143721 is 127341941.

149143721 = 8635² + 8636².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74580496 + 74563225 = 8636^2 + 8635^2 .

It is a cyclic number.

It is not a de Polignac number, because 149143721 - 2²⁶ = 82034857 is a prime.

It is a super-3 number, since 3×149143721³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (149143727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74571860 + 74571861.

It is an arithmetic number, because the mean of its divisors is an integer number (74571861).

Almost surely, 2^149143721 is an apocalyptic number.

149143721 is the 8636-th centered square number.

It is an amenable number.

149143721 is a deficient number, since it is larger than the sum of its proper divisors (1).

149143721 is an equidigital number, since it uses as much as digits as its factorization.

149143721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 149143721 is about 12212.4412383438. The cubic root of 149143721 is about 530.3163188285.

The spelling of 149143721 in words is "one hundred forty-nine million, one hundred forty-three thousand, seven hundred twenty-one".