1261525072 has 10 divisors (see below), whose sum is σ = 2444204858. Its totient is φ = 630762528.

The previous prime is 1261525063. The next prime is 1261525081. The reversal of 1261525072 is 2705251621.

It is an interprime number because it is at equal distance from previous prime (1261525063) and next prime (1261525081).

It can be written as a sum of positive squares in only one way, i.e., 745508416 + 516016656 = 27304^2 + 22716^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39422643 + ... + 39422674.

Almost surely, 2^1261525072 is an apocalyptic number.

It is an amenable number.

1261525072 is a deficient number, since it is larger than the sum of its proper divisors (1182679786).

1261525072 is an equidigital number, since it uses as much as digits as its factorization.

1261525072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78845325 (or 78845319 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 1261525072 is about 35517.9542203658. The cubic root of 1261525072 is about 1080.5178906203.

Adding to 1261525072 its reverse (2705251621), we get a palindrome (3966776693).

The spelling of 1261525072 in words is "one billion, two hundred sixty-one million, five hundred twenty-five thousand, seventy-two".